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September 2015
Agency for Healthcare Research and Quality
Center for Financing, Access, and Cost Trends
540 Gaither Road
Rockville, MD 20850
(301) 427-1406
Table of Contents
A. Data Use Agreement
B. Background
1.0 Household Component
2.0 Medical Provider Component
3.0 Survey Management and Data Collection
C. Technical and Programming Information
1.0 General Information
2.0 Data File Information
2.1 Codebook Structure
2.2 Reserved Codes
2.3 Codebook Format
2.4 Variable Naming
2.5 File Contents
2.5.1 Identifier Variables (DUID-CONDRN)
2.5.2 Medical Condition Variables (AGEDIAG-CCCODEX)
2.5.2.1 Priority Conditions and Injuries
2.5.2.2 Age Priority Condition Began
2.5.2.3 Follow-up Questions for Injuries and Priority Conditions
2.5.2.4 Sources for Conditions on the MEPS Conditions File
2.5.2.5 Treatment of Data from Rounds Not Occurring in 2013
2.5.2.6 Rounds in Which Conditions Were Reported/Selected (CRND1 – CRND5)
2.5.2.7 Disability Flag Variables
2.5.2.8 Diagnosis, Condition, and Procedure Codes
2.5.2.9 Clinical Classification Codes
2.5.3 Utilization Variables (OBNUM – RXNUM)
3.0 Survey Sample Information
3.1 Overview
3.2 Details on Person Weight Construction
3.2.1 MEPS Panel 17 Weight Development Process
3.2.2 MEPS Panel 18 Weight Development Process
3.2.3 The Final Weight for 2013
3.2.4 Coverage
3.3 Using MEPS Data for Trend Analysis
4.0 Merging/Linking MEPS Data Files
4.1 National Health Interview Survey (NHIS)
4.2 Longitudinal Analysis
References
Appendix 1: Variable-Source Crosswalk
Appendix 2: Condition, Procedure, and Clinical Classification Code Frequencies
Appendix 3: Clinical Classification Code to ICD-9-CM Code Crosswalk
Appendix 4: List of Invalid ICD-9-CM Codes
Appendix 5: List of Conditions Asked in Priority Conditions Enumeration Section
Individual identifiers have been removed from the
micro-data contained in these files. Nevertheless, under sections 308 (d) and
903 (c) of the Public Health Service Act (42 U.S.C. 242m and 42 U.S.C. 299 a-1),
data collected by the Agency for Healthcare Research and Quality (AHRQ) and/or
the National Center for Health Statistics (NCHS) may not be used for any purpose
other than for the purpose for which they were supplied; any effort to determine
the identity of any reported cases is prohibited by law.
Therefore in accordance with the above referenced
Federal Statute, it is understood that:
- No one is to use the data in this data set in any way except
for statistical reporting and analysis; and
- If the identity of any person or establishment should be
discovered inadvertently, then (a) no use will be made of this
knowledge, (b) the Director Office of Management AHRQ will be
advised of this incident, (c) the information that would
identify any individual or establishment will be safeguarded or
destroyed, as requested by AHRQ, and (d) no one else will be
informed of the discovered identity; and
- No one will attempt to link this data set with individually
identifiable records from any data sets other than the Medical
Expenditure Panel Survey or the National Health Interview
Survey.
By using these data you signify your agreement to
comply with the above stated statutorily based requirements with the knowledge
that deliberately making a false statement in any matter within the jurisdiction
of any department or agency of the Federal Government violates Title 18 part 1
Chapter 47 Section 1001 and is punishable by a fine of up to $10,000 or up to 5
years in prison.
The Agency for Healthcare Research and Quality
requests that users cite AHRQ and the Medical Expenditure Panel Survey as the
data source in any publications or research based upon these data.
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The Medical Expenditure Panel Survey (MEPS) provides
nationally representative estimates of health care use, expenditures, sources of
payment, and health insurance coverage for the U.S. civilian
noninstitutionalized population. The MEPS Household Component (HC) also provides
estimates of respondents’ health status, demographic and socio-economic
characteristics, employment, access to care, and satisfaction with health care.
Estimates can be produced for individuals, families, and selected population
subgroups. The panel design of the survey, which includes 5 Rounds of interviews
covering 2 full calendar years, provides data for examining person level changes
in selected variables such as expenditures, health insurance coverage, and
health status. Using computer assisted personal interviewing (CAPI) technology,
information about each household member is collected, and the survey builds on
this information from interview to interview. All data for a sampled household
are reported by a single household respondent.
The MEPS-HC was initiated in 1996. Each year a new
panel of sample households is selected. Because the data collected are
comparable to those from earlier medical expenditure surveys conducted in 1977
and 1987, it is possible to analyze long-term trends. Each annual MEPS-HC sample
size is about 15,000 households. Data can be analyzed at either the person or
event level. Data must be weighted to produce national
estimates.
The set of households selected for each panel of the
MEPS HC is a subsample of households participating in the previous year’s
National Health Interview Survey (NHIS) conducted by the National Center for
Health Statistics. The NHIS sampling frame provides a nationally representative
sample of the U.S. civilian noninstitutionalized population and reflects an
oversample of Blacks and Hispanics. In 2006, the NHIS implemented a new sample
design, which included Asian persons in addition to households with Black and
Hispanic persons in the oversampling of minority populations. MEPS further
oversamples additional policy relevant sub-groups such as low income households.
The linkage of the MEPS to the previous year’s NHIS provides additional data for
longitudinal analytic purposes.
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Upon completion of the household CAPI interview and
obtaining permission from the household survey respondents, a sample of medical
providers are contacted by telephone to obtain information that household
respondents can not accurately provide. This part of the MEPS is called the
Medical Provider Component (MPC) and information is collected on dates of visit,
diagnosis and procedure codes, charges and payments. The Pharmacy Component
(PC), a subcomponent of the MPC, does not collect charges or diagnosis and
procedure codes but does collect drug detail information, including National
Drug Code (NDC) and medicine name, as well as date filled and sources and
amounts of payment. The MPC is not designed to yield national estimates. It is
primarily used as an imputation source to supplement/replace household reported
expenditure information.
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MEPS HC and MPC data are collected under the authority
of the Public Health Service Act. Data are collected under contract with Westat,
Inc. (MEPS HC) and Research Triangle Institute (MEPS MPC). Data sets and summary
statistics are edited and published in accordance with the confidentiality
provisions of the Public Health Service Act and the Privacy Act. The National
Center for Health statistics (NCHS) provides consultation and technical
assistance.
As soon as data collection and editing are completed,
the MEPS survey data are released to the public in staged releases of summary
reports, micro data files, and tables via the MEPS Web site:
meps.ahrq.gov.
Selected data can be analyzed through MEPSnet, an on-line interactive tool
designed to give data users the capability to statistically analyze MEPS data in
a menu-driven environment.
Additional information on MEPS is available from the
MEPS project manager or the MEPS public use data manager at the Center for
Financing, Access, and Cost Trends, Agency for Healthcare Research and Quality,
540 Gaither Road, Rockville, MD 20850 (301-427-1406).
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This documentation describes the data contained in
MEPS Public Use Release HC-162, which is one in a series of public use data
files to be released from the 2013 Medical Expenditure Panel Survey Household
Component (MEPS HC). Released in ASCII (with related SAS, SPSS, and Stata
programming statements and data user information) and SAS formats, this public
use file provides information on household-reported medical conditions collected
on a nationally representative sample of the civilian noninstitutionalized
population of the United States for calendar year 2013 MEPS HC. The file
contains 27 variables and has a logical record length of 87 with an additional
2-byte carriage return/line feed at the end of each record.
This documentation offers a brief overview of the
types and levels of data provided and the content and structure of the files. It
contains the following sections:
- Data File Information
- Survey Sample Information
- Merging/Linking MEPS Data Files
- Appendices
- Variable-Source Crosswalk
- Detailed ICD-9-CM Condition, Procedure, and Clinical Classification Code Frequencies
- Clinical Classification Code to ICD-9-CM Code Crosswalk
- List of Invalid ICD-9-CM Codes
- List of Conditions Asked in Priority Conditions Enumeration Section
A codebook of all the variables included in the 2013
Medical Conditions File is provided in an accompanying file.
For more information on MEPS survey design, see T.
Ezzati-Rice, et al., 1998-2007 and S.
Cohen, 1996. A copy of the survey instrument used to collect the information on
this file is available on the MEPS Website:
meps.ahrq.gov.
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This file contains 123,875 records. Each record
represents one medical condition reported for a household survey member who
resides in an eligible responding household and who has a positive person or
family weight.
Conditions created in the Priority Condition
Enumeration (PE) section were asked in the context of "has person ever been told
by a doctor or other health care professional that they have (condition)?"
except joint pain and chronic bronchitis, which ask only about the
last 12 months. If the response is Yes (1), then a condition record is generated
but only included in this file if the condition is current. A condition
is defined as current if it is linked to an event or disability day or a
condition the person is currently experiencing (i.e., a condition selected in
the Condition Enumeration (CE) section).
Records meeting one of the following criteria are
included on the file:
In Panel 18:
- Round 1 and Round 2 records that are current conditions. A
current condition is defined as a condition linked to a 2013
event or disability day, or a condition the person is currently
experiencing (i.e., a condition selected in the CE section);
- Round 3 conditions that were linked to a 2013 event;
- Round 3 conditions that were due to an accident or injury;
- Round 3 priority condition records that are current and
either the age of diagnosis is less than or equal to
the person’s age as of 12/31/2013 or the age of diagnosis is
refused, don’t know, or not ascertained; or
- Round 3 conditions where 50 percent or more of person’s
reference period occurred in 2013.
In Panel 17:
- Round 3, Round 4, and Round 5 records that are current
conditions. A current condition is defined as a condition linked
to a 2013 event or a condition the person is currently
experiencing (i.e., a condition selected in the CE section); or
- Round 1 and Round 2 condition records that are linked to a
2013 event or disability day, or a condition the person is
currently experiencing in 2013 (i.e., a condition selected in
the CE section).
For most variables on the file, the codebook provides
both weighted and unweighted frequencies. The exceptions to this are weight
variables and variance estimation variables. Only unweighted frequencies of
these variables are included in the accompanying codebook file. See the Weights
Variables list in Appendix 1, Variable-Source Crosswalk.
Data from this file can be merged with 2013 MEPS
person-level data to append person-level characteristics such as demographic or
health insurance characteristics to each record by using DUPERSID (see Section
4.0 for details). Since each record represents a single condition reported by a
household respondent, some household members may have multiple medical
conditions and thus will be represented by multiple records on this file. Other
household members may have had no reported medical conditions and thus will have
no records on this file. Still other household members may have had a
reported medical condition that did not meet the criteria above and thus will
have no records on this file. Data from this file also can be merged to 2013
MEPS Event Files (HC-160A through HC-160H) by using the link files provided in
HC-160I. (See HC-160I documentation for details.)
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The codebook and data file list variables in the following order:
- Unique person identifiers
- Unique condition identifiers
- Medical condition variables
- Utilization variables
- Weight and variance estimation variables
Note that the person identifier is unique within this data year.
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The following reserved code values are used:
| Value |
Definition |
| -1 INAPPLICABLE |
Question was not asked due to skip pattern |
| -7 REFUSED |
Question was asked and respondent refused to answer question |
| -8 DK |
Question was asked and respondent did not know answer |
| -9 NOT ASCERTAINED |
Interviewer did not record the data |
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This codebook describes an ASCII data set and provides
the following programming identifiers for each variable:
| Identifier |
Description |
| Name |
Variable name (maximum of 8 characters) |
| Description |
Variable descriptor (maximum 40 characters) |
| Format |
Number of bytes |
| Type |
Type of data: numeric (indicated by NUM) or character (indicated by CHAR) |
| Start |
Beginning column position of variable in record |
| End |
Ending column position of variable in record |
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In general, variable names reflect the content of the
variable, with an 8-character limitation. Edited variables end in an "X" and are
so noted in the variable label. (CONDIDX, which is an encrypted identifier
variable, also ends in an "X".)
Variables contained in this delivery were derived
either from the questionnaire itself or from the CAPI. The source of each
variable is identified in Appendix 1 "Variable-Source Crosswalk." Sources for
each variable are indicated in one of three ways: (1) variables derived from
CAPI or assigned in sampling are so indicated; (2) variables collected at one or
more specific questions have those numbers and questionnaire sections indicated
in the "SOURCE" column; and (3) variables constructed from multiple questions
using complex algorithms are labeled "Constructed" in the "SOURCE" column.
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The definitions of Dwelling Units (DUs) in the MEPS HC
are generally consistent with the definitions employed for the National Health
Interview Survey (NHIS). The dwelling unit ID (DUID) is a 5-digit random number
assigned after the case was sampled for MEPS. The person number (PID) uniquely
identifies each person within the dwelling unit.
The variable DUPERSID uniquely identifies each person
represented on the file and is the combination of the variables DUID and PID.
CONDN is the condition number and uniquely identifies
each condition reported for an individual. The range on this file for CONDN is
11-681 and the range of total records for any one person on the file is 1-49.
The variable CONDIDX uniquely identifies each
condition (i.e., each record on the file) and is the combination of DUPERSID and
CONDN. CONDIDX is always a length of 12 with DUPERSID (8) and CONDN (4, with
leading zeros added if needed) combined. For CONDIDX, the condition number is
padded with leading zeroes to ensure consistent length.
PANEL is a constructed variable used to specify the
panel number for the interview in which the condition was reported. PANEL will
indicate either Panel 17 or Panel 18.
CONDRN indicates the round in which the condition was
first reported. For a small number of cases, conditions that actually
began in an earlier round were not reported by respondents until subsequent
rounds of data collection. During file construction, editing was performed for
these cases in order to reconcile the round in which a condition began and the
round in which the condition was first reported.
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This file contains variables describing medical
conditions reported by respondents in several sections of the MEPS
questionnaire, including the Condition Enumeration section, all questionnaire
sections collecting information about health provider visits, prescription
medications, and disability days (see Variable-Source Crosswalk in Appendix 1
for details).
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Certain conditions were a priori designated as
"priority conditions" due to their prevalence, expense, or relevance to policy.
Some of these are long-term, life-threatening conditions, such as cancer,
diabetes, emphysema, high cholesterol, hypertension, ischemic heart disease, and
stroke. Others are chronic manageable conditions, including arthritis and
asthma. The only mental health condition on the priority conditions list is
attention deficit hyperactivity disorder/attention deficit disorder.
When a condition was first mentioned, respondents were
asked whether it was due to an accident or injury (INJURY=1). Only non-priority
conditions (i.e., conditions reported in a section other than PE) are eligible
to be injuries. The interviewer is prevented from selecting priority conditions
as injuries.
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The age of diagnosis (AGEDIAG) was collected for all
priority conditions, except joint pain. Beginning in FY 2013, for confidentiality reasons, AGEDIAG is set to
Inapplicable (-1) for cancer conditions.
To ensure confidentiality,
age of diagnosis was top-coded to 85. This corresponds with the
age top-coding in person-level PUFs.
Beginning with Panel 17 Round 5, Panel 18 Round 3,
Panel 19 Round 1, the day, month, and year an accident or injury occurred
(ACCDENTD, ACCDENTM, and ACCDENTY) and whether the accident or injury occurred
before or after January 1 (ACCDNJAN) of the reference year when ACCDENTY is
refused, don’t know, or not ascertained, were dropped from the MEPS interview.
While Panel 17 Round 5 and Panel 18 Round 3 were fielded in 2014, they collect
data relevant to 2013. Because there is not a full year’s worth of data for
these variables in 2013, the variables are no longer on the file starting in
2013.
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When a respondent reported that a condition resulted
from an accident or injury (INJURY=1), respondents were asked during the round
in which the injury was first reported whether the accident/injury occurred at
work (ACCDNWRK). This question was not asked about persons aged 15 and younger;
the condition had ACCDNWRK coded to inapplicable (-1) for those persons.
Prior to FY 2013, for cancer conditions collected in
the PE section, a follow-up question was asked when the cancer was first
reported to determine whether the cancer was in remission/under control
(REMISSN). Beginning in FY 2013, REMISSN was removed from the file for
confidentiality purposes.
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The records on this file correspond with medical
condition records collected by CAPI and stored on a person’s MEPS conditions
roster. Conditions can be added to the MEPS conditions roster in several ways. A
condition can be reported in the Priority Condition Enumeration (PE) section in
which persons are asked if they have been diagnosed with specific conditions.
The condition can be identified as the reason reported by the household
respondent for a particular medical event (hospital stay, outpatient visit,
emergency room visit, home health episode, prescribed medication purchase, or
medical provider visit). The condition may be reported as the reason for one or
more episodes of disability days. Finally, the condition may be reported by the
household-level respondent as a condition "bothering" the person during the
reference period (see question CE03). Conditions reported in the PE section that
are not current are not included on this file.
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Prior to the 2008 file, priority conditions reported
during Rounds 1 and 2 of the second year panel were included on the file even if
the conditions were not related to an event or disability day or reported as a
serious condition occurring in the second year of the panel. Beginning in 2008,
priority conditions are included on the file only if they are current
conditions. A current condition is defined as a condition linked to an event or
disability day or a condition the person is currently experiencing (i.e., a
condition selected in the Condition Enumeration (CE) section). Conditions from
Rounds 1 and 2 that are not included in the 2013 file are available in the 2012
Medical Conditions File. Note that, for some Rounds 1 and 2 records, data may
not be available on the previous year’s file. This situation can occur when a
person does not have a positive person or family weight in the first year but is
assigned a positive weight in the subsequent year. The situation can also occur
if the condition is a priority condition for which no events or disability days
were reported in the first year but are reported in the second year. For 2013,
157 conditions from Panel 17 Rounds 1 and 2 are included on the 2013 Medical
Conditions File for persons who did not appear on the previous year’s file.
Note: Priority conditions are generally chronic
conditions. Even though a person may not have reported an event or disability
day in 2013 due to the condition, or reported generally experiencing the
condition in 2013, analysts should consider that the person is probably still
experiencing the condition. If a Panel 17 person reported a priority condition
in Round 1 or 2 and did not have an event or disability day for the condition in
Round 3, 4, or 5, the condition will not be included on the 2013 Medical
Conditions File.
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A set of constructed variables indicates the round in
which the condition was first reported (CONDRN), and the subsequent round(s) in
which the condition was selected (CRND1 – CRND5). The condition may be reported
or selected when the person reports an event or disability day that occurred due
to the condition, or the condition may be selected as a serious condition that
is not linked to any events or disability days. For example, consider a
condition for which CRND1 = 0, CRND2 = 1, and CRND3 = 1. For non-priority
conditions, this sequence of CRND indicators on a condition record implies that
the condition was not present during Round 1 (CRND1 = 0), was first mentioned
during Round 2, and was selected during Round 3. For priority conditions, it is
necessary to look at CONDRN rather than CRND# to determine in which round the
condition was first reported. In addition to the scenario above, this sequence
of CRND indicators may imply for priority conditions that the condition was
reported in the PE section in Round 1 but was not connected with an event or
disability day, and not selected in the CE section as a current condition until
Rounds 2 and 3.
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Beginning with Panel 17 Round 5, Panel 18 Round 3,
Panel 19 Round 1, three Disability Days variables indicating whether a condition
is associated with a missed work day (WRKINBED), a missed school day (SCLINBED),
or a day spent in bed (DDBEDAYS) were dropped from the MEPS interview.
Consequently, the corresponding Conditions file variables, MISSWORK, MISSSCHL,
and INBEDFLG, were dropped from this file. While Panel 17 Round 5 and Panel 18
Round 3 were fielded in 2014, they collect data relevant to 2013. Because there
is not a full year’s worth of data for these variables in 2013, the variables
are no longer on the file starting in 2013.
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The medical conditions and procedures reported by the
Household Component respondent were recorded by the interviewer as verbatim
text, which was then coded by professional coders to fully-specified ICD-9-CM
codes, including medical condition and V codes (see Health Care Financing
Administration, 1980). Although codes were verified and error rates did not
exceed 2 percent, analysts should not presume this level of precision in the
data; the ability of household respondents to report condition data that can be
coded accurately should not be assumed (see Cox and Iachan, 1987; Edwards, et
al, 1994; and Johnson and Sanchez, 1993). Some condition information is
collected in the Medical Provider Component of MEPS. However, since it is not
available for everyone in the sample, it is not used to supplement, replace, or
verify household-reported condition data.
Data analysts should also use caution when working
with the procedure codes on this file. Procedure codes are gathered in the same
manner as the conditions data, i.e., reports by household respondents. The
survey does not prompt respondents for procedures, so procedures are
under-reported. In addition, the ability of household respondents to accurately
report procedures should not be assumed. Analysts should not use available data
on procedures to make estimates of frequencies of specific procedures or to
extrapolate to national estimates.
Professional coders followed specific guidelines in
coding missing values to the ICD-9-CM diagnosis condition and procedure
variables. The ICD-9-CM diagnosis condition variable (ICD9CODX) was coded -9
where the verbatim text fell into one of three categories: (1) the text
indicated that the condition was unknown (e.g., DK); (2) the text indicated the
condition could not be diagnosed by a doctor (e.g., doctor doesn’t know); or (3)
the specified condition was not codeable and a procedure could not be discerned
from the text. ICD9CODX was coded -1 where the verbatim text strictly denoted a
procedure and not a condition. The ICD-9-CM procedure variable (ICD9PROX) was
coded -9 where the verbatim text strictly denoted a procedure, but the text was
not specific enough to assign a procedure code. ICD9PROX was set to -1 where the
text strictly specified a condition and not a procedure.
In order to preserve confidentiality, nearly all of
the diagnosis condition codes provided on this file have been collapsed from
fully-specified codes to 3-digit code categories. Table 1 in Appendix 2 provides
unweighted and weighted frequencies for all ICD-9-CM condition code values
reported on the file. In this table, values that reflect this collapsing have an
asterisk in the label indicating that the 3-digit category includes all the
subclassifications within that category. For example, the ICD9CODX value of 034
"Strep Throat/Scarlet Fev *" includes the fully-specified subclassifications
034.0 and 034.1; the value 296 "Affective Psychoses*" includes the
fully-specified subclassifications 296.0 through 296.99. Less than 7 percent of
the records on this file were edited further by collapsing two or more 3-digit
codes into one 3-digit code. Some values of ICD9CODX may have been recoded to
Not Ascertained (-9) for confidentiality reasons.
Beginning with the FY12 Conditions file, for
confidentiality purposes, ICD-9-CM codes are recoded to broader codes by
clinicians for conditions that occur fewer than 20 times within a year’s
conditions file and for clinically rare conditions. A condition is deemed
clinically rare if it appears on the National Institutes of Health’s list of
rare diseases. Each year, a few conditions on the final file fall below the
confidentiality threshold. This is due to the multistage file development
process. The confidentiality recoding is performed on the preliminary version of
the Conditions file each year. This preliminary version is used in the
development of other event PUFs and, in turn, these event PUFs are used in the
development of the final conditions file. During this process, some records from
the preliminary file are dropped because only records that are relevant to the
current data year are reflected in the final Conditions PUF.
Most of the procedure codes were collapsed from
fully-specified codes to 2-digit category codes. Table 2 in Appendix 2 provides
unweighted and weighted frequencies for ICD9PROX, and this type of collapsing is
identified by an asterisk in the variable label. For example, the ICD9PROX value
of 81 "Joint Repair*" includes subclassifications 81.0 through 81.99. Less than
1 percent of records were further edited to combine two or more 2-digit
categories.
Note that, through FY 2012, for conditions related to
certain medical events, the ICD-9-CM codes on this file were also released in
the Prescribed Medicines, Emergency Room Visits, Office-based Medical Provider
Visits, Outpatient Department Visits, and Inpatient Hospital Stays Event Files.
Because the ICD-9-CM codes have been collapsed, it is possible for there to be
duplicate ICD-9-CM condition or procedure codes linked to a single medical event
when different fully-specified codes are collapsed into the same code. For
information on merging data on this file with the 2013 MEPS Event Files (HC-160A
through HC-160H) refer to the link files provided in HC-160I, and see HC-160I
documentation for details.
Each year certain ICD-9-CM codes are ‘retired’ from
use. Beginning in 2012, these codes are removed from the ‘history’ table
(Appendix 3) prior to condition coding processing and listed separately for
reference (see List of Invalid ICD-9-CM Codes in Appendix 4).
In a small number of cases, diagnosis, condition, and
procedure codes were further recoded to -9 if they denoted a pregnancy for a
person younger than 16 or older than 44. There were 10 records recoded in this
manner on the 2013 Medical Conditions File. The person’s age was determined by
linking the 2013 Medical Conditions File to the 2012 and 2013 Person-Level Use
PUFs. If the person’s age is under 16 or over 44 in the round in which the
condition or procedure was reported, the appropriate condition or procedure code
was recoded to -9.
Users should note that because of the design of the
survey, most deliveries (i.e., births) are coded as pregnancies. For more
accurate estimates for deliveries, analysts should use RSNINHOS "Reason Entered
Hospital" found on the Hospital Inpatient Stays Public Use File (HC-160D).
Conditions and procedures were reported in the same
sections of the HC questionnaire (see Variable-Source Crosswalk in Appendix 1).
Labels for all values of the variables ICD9CODX and ICD9PROX, as shown in Tables
1 and 2, are provided in the SAS programming statements included in this release
(see the H162SU.TXT file).
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ICD-9-CM condition codes have been aggregated into
clinically meaningful categories that group similar conditions (CCCODEX).
CCCODEX was generated using Clinical Classification Software (formerly known as
Clinical Classifications for Health Care Policy Research (CCHPR)), which
aggregates conditions and V-codes into mutually exclusive categories, most of
which are clinically homogeneous (Elixhauser, et al, 2000). Appendix 3 lists the
ICD-9-CM codes that have been aggregated for each clinical classification
category.
The reported ICD-9-CM condition code values were
mapped to the appropriate clinical classification category prior to being
collapsed to 3-digit ICD-9-CM condition codes. The result is that every record
which has an ICD-9-CM diagnosis code also has a clinical classification code.
For confidentiality purposes, ICD-9-CM codes are
recoded to broader codes by clinicians for conditions that occur fewer than 20
times within a year’s conditions file and for clinically rare conditions.
CCS codes are assigned to the original fully-specified
ICD-9-CM codes. When the original ICD-9-CM codes undergo recoding, no changes
are made to the assigned CCS codes.
As with ICD9CODX and ICD9PROX, professional coders
followed specific guidelines in setting CCCODEX to a missing value. CCCODEX was
coded -9 where the verbatim text fell into one of three categories: (1) the text
indicated that the condition was unknown (e.g., DK); (2) the text indicated the
condition could not be diagnosed by a doctor (e.g., doctor doesn’t know); or (3)
the specified condition was not codeable and a procedure could not be discerned
from the text. CCCODEX was coded -1 where the verbatim text strictly denotes a
procedure and not a condition.
A small number (less than 7 percent) of clinical
classification codes have been edited for confidentiality purposes. Table 3 in
Appendix 2 provides weighted and unweighted frequencies for CCCODEX. Labels for
all values of the variable CCCODEX, as shown in Table 3, are provided in the SAS
programming statements included in this release (see the H162SU.TXT file).
In a small number of cases, clinical classification
codes were further recoded to -9 if they denoted a pregnancy for a person
younger than 16 or older than 44. There were 10 records recoded in this manner
on the 2013 Medical Conditions File. The person’s age was determined by linking
the 2013 Medical Conditions File to the 2012 and 2013 Person-Level Use PUFs. If
the person’s age is under 16 or over 44 in the round in which the condition was
reported, the appropriate clinical classification code was recoded to -9.
Note that, prior to 2004 the range for the variable
CCCODEX was 001 through 260. In 2004, revisions to the coding of mental
disorders were implemented. The codes 650 through 663 replaced 065 through 075
in 2004. Beginning in 2007, the mental disorders codes were reorganized again.
Alcohol and substance abuse disorders were broken into separate categories, and
miscellaneous mental disorders were renumbered.
Analysts should use the clinical classification codes
listed in the Conditions PUF document (HC-162) and the Appendix to the Event
Files document (HC-160I) when analyzing MEPS conditions data. Although there is
a list of clinical classification codes and labels on the Healthcare Cost and
Utilization Project (HCUP) Website, if updates to these codes and/or labels are
made on the HCUP Website after the release of the 2013 MEPS PUFs, these updates
will not be reflected in the 2013 MEPS data.
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The variables OBNUM, OPNUM, HHNUM, IPNUM, ERNUM, and
RXNUM indicate the total number of 2013 events that can be linked to each
condition record on the current file, i.e., office-based, outpatient, home
health, inpatient hospital stays, emergency room visits, and prescribed
medicines, respectively.
These counts of events were derived from Expenditure
Event Public Use Files (HC-160G, HC-160F, HC-160H, HC-160D, HC-160E, and
HC-160A). Events associated with conditions include all utilization that
occurred between January 1, 2013 and December 31, 2013.
Because persons can be seen for more than one
condition per visit, these frequencies will not match the person or event-level
utilization counts. For example, if a person had one inpatient hospital stay and
was treated for a fractured hip, a fractured shoulder, and a concussion, each of
these conditions has a unique record in this file and IPNUM=1 for each record.
By summing IPNUM for these records, the total inpatient hospital stays would be
three when actually there was only one inpatient hospital stay for that person
and three conditions were treated. These variables are useful for determining
the number of inpatient hospital stays for head injuries, hip fractures, etc.
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There is a single full year person-level weight
(PERWT13F) assigned to each record for each key, in-scope person who responded
to MEPS for the full period of time that he or she was in-scope during 2013. A
key person was either a member of a responding NHIS household at the time of the
interview or joined a family associated with such a household after being
out-of-scope at the time of the NHIS (the latter circumstance includes newborns
as well as those returning from military service, an institution, or residence
in a foreign country). A person is in-scope whenever he or she is a member of
the civilian noninstitutionalized portion of the U.S. population.
There has been an important change in the MEPS sample
design that is worth noting. A new NHIS sample design was implemented in 2006
with a new sample of PSUs and segments, independent of the sample design used
from 1995-2005. To the extent that the new NHIS design provides better coverage
of the civilian noninstitutionalized U.S. population in general and specific
subgroups in particular, differences between estimates based on the old and new
designs could arise in both the NHIS and MEPS due to such improved coverage
rather than actual changes in the characteristics of the target population.
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The person-level weight PERWT13F was developed in
several stages. First, person-level weights for Panel 17 and Panel 18 were
created separately. The weighting process for each panel included adjustments
for nonresponse over time and calibration to independent population totals. The
calibration was initially accomplished separately for each panel by raking the
corresponding sample weights to Current Population Survey (CPS) population
estimates based on five variables. The five
variables used in the establishment of the initial person-level control
figures were: census region (Northeast, Midwest, South, West); MSA status (MSA,
non-MSA); race/ethnicity (Hispanic; Black, non-Hispanic; Asian, non-Hispanic;
and other); sex; and age. A 2013 composite weight was then formed by multiplying
each weight from Panel 17 by the factor .51 and each weight from Panel 18 by the
factor .49. Control totals were established using poverty status (five
categories: below poverty, from 100 to 125 percent of poverty, from 125 to 200
percent of poverty, from 200 to 400 percent of poverty, at least 400 percent of
poverty) the other five variables previously used in the weight calibration, and
a variable associated with number of hospital stays for those under the age of
65.
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The person-level weight for MEPS Panel 17 was
developed using the 2012 full year weight for an individual as a "base" weight
for survey participants present in 2012. For key, in-scope members who joined an
RU some time in 2013 after being out-of-scope in 2012, the initially assigned
person-level weight was the corresponding 2012 family weight. The weighting
process included an adjustment for person-level nonresponse over Rounds 4 and 5
as well as raking to population control figures for December 2013 for key,
responding persons in-scope on December 31, 2013. These control figures were
derived by scaling back the population distribution obtained from the March 2014
CPS to reflect the December 31, 2014 estimated population total (estimated based
on Census projections for January 1, 2013). Variables used for person-level
raking included: census region (Northeast, Midwest, South, West); MSA status
(MSA, non-MSA); race/ethnicity (Hispanic; Black, non-Hispanic; Asian,
non-Hispanic; and other); sex; and age. The final
weight for key, responding persons who were not in-scope on December 31, 2013
but were in-scope earlier in the year was the person weight after the
nonresponse adjustment.
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The person-level weight for MEPS Panel 18 was
developed using the 2013 MEPS Round 1 person-level weight as a "base" weight.
For key, in-scope members who joined an RU after Round 1, the Round 1 family
weight served as a "base" weight. The weighting process included an adjustment
for nonresponse over the remaining data collection rounds in 2013 as well as
raking to the same population control figures for December 2013 used for the
MEPS Panel 17 weights for key, responding persons in-scope on December 31, 2013.
The same five variables employed for
Panel 17 raking (census region, MSA status, race/ethnicity, sex, and age) were
used for Panel 18 raking. Again, the final weight for key, responding persons
who were not in-scope on December 31, 2013 but were in-scope earlier in the year
was the person weight after the nonresponse adjustment.
Note that the MEPS Round 1 weights for both panels
incorporated the following components: a weight reflecting the original
household probability of selection for the NHIS and an adjustment for NHIS
nonresponse; a factor representing the proportion of the 16 NHIS panel-quarter
combinations eligible for MEPS; the oversampling of certain subgroups for MEPS
among the NHIS household respondents eligible for MEPS; ratio-adjustment to
NHIS-based national population estimates at the household (occupied DU) level;
adjustment for nonresponse at the DU level for Round 1; and poststratification
to U.S. civilian noninstitutionalized population estimates at the family and
person level obtained from the corresponding March CPS databases.
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The final raking of those in-scope at the end of the
year has been described above. In addition, the composite weights of two groups
of persons who were out-of-scope on December 31, 2013 were poststratified.
Specifically, the weights of those who were in-scope some time during the year,
out-of-scope on December 31, and entered a nursing home during the year were
poststratified to a corresponding control total obtained from the 1996 MEPS
Nursing Home Component. The weights of persons who died while in-scope
during 2013 were poststratified to corresponding estimates derived using data
obtained from the Medicare Current Beneficiary Survey (MCBS) and Vital
Statistics information provided by the National Center for Health Statistics
(NCHS). Separate decedent control totals were developed for the "65 and older"
and "under 65" civilian noninstitutionalized populations.
In developing the final person-level weight for 2013
(PERWT13F), an additional raking dimension was included to adjust the proportion
of persons under age 65 with at least one inpatient discharge based on
independent sources of data reviewed by AHRQ. The table below shows ratios of
weighted numbers of non-elderly persons that resulted from including this
additional raking dimension to that of corresponding estimates without the
additional dimension.
Ratio of Adjusted to Unadjusted Weights
| Number of Inpatient Discharges (IPDIS13) |
Non-elderly (AGE13X < 65) |
| 0 |
0.98938 |
| 1+ |
1.21587 |
Overall, the weighted population estimate for the
civilian noninstitutionalized population for December 31, 2013 is 312,098,312
(PERWT13F>0 and INSC1231=1). The sum of the person-level weights across all
persons assigned a positive person-level weight is 315,721,982.
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The target population for MEPS in this file is the
2013 U.S. civilian noninstitutionalized population. However, the MEPS sampled
households are a subsample of the NHIS households interviewed in 2011 (Panel 17)
and 2012 (Panel 18). New households created after the NHIS interviews for the
respective panels and consisting exclusively of persons who entered the target
population after 2011 (Panel 17) or after 2012 (Panel 18) are not covered by
MEPS. Neither are previously out-of-scope persons who join an existing household
but are unrelated to the current household residents. Persons not covered by a
given MEPS panel thus include some members of the following groups: immigrants,
persons leaving the military, U.S. citizens returning from residence in another
country, and persons leaving institutions. The set of uncovered persons
constitutes only a small segment of the MEPS target population.
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MEPS began in 1996, and the utility of the survey for
analyzing health care trends expands with each additional year of data; however,
it is important to consider a variety of factors when examining trends over time
using MEPS. Statistical significance tests should be conducted to assess the
likelihood that observed trends may be attributable to sampling variation. The
modification to the weight based on hospital stays potentially could affect some
analyses of trend. The length of time being analyzed should also be considered.
In particular, large shifts in survey estimates over short periods of time (e.g.
from one year to the next) that are statistically significant should be
interpreted with caution, unless they are attributable to known factors such as
changes in public policy, economic conditions, or MEPS survey methodology.
Analysts may wish to consider using techniques to
evaluate, smooth, or stabilize analyses of trends
using MEPS data such as comparing pooled time periods (e.g.
2009–2010 versus 2012–2013), working with moving averages, or using modeling
techniques with several consecutive years of MEPS data to test the fit of
specified patterns over time. However, it should be noted that there are issues
with pooling as well as comparing conditions data gathered prior to 2007 with
the data collected in 2007 and beyond. Improved methods (a Priority Conditions
Enumeration section and priority conditions automatically flagged by CAPI), were
implemented for collecting priority conditions data for many of the conditions
beginning in 2007.
Finally, researchers should be aware of the impact of
multiple comparisons on Type I error. Without making appropriate allowance for
multiple comparisons, undertaking numerous statistical significance tests of
trends increases the likelihood of concluding that a change has taken place when
one has not.
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Data from the current file can be used alone or in
conjunction with other files. Merging characteristics of interest from
person-level files expands the scope of potential estimates. See HC-160I for
instructions on merging the Conditions File to the Medical Event Files.
Person-level characteristics can be merged to this Conditions File using the
following procedure:
- Sort the person-level file by person identifier, DUPERSID.
Keep only DUPERSID and the variables to be merged onto the
Conditions File.
- Sort the Conditions File by person identifier, DUPERSID.
- Merge both files by DUPERSID, and output all records in the
Conditions File.
- If PERS contains the person-level variables, and COND is the
Conditions File, the following code can be used to add
person-level variables to the person’s conditions in the
Condition-level file.
- PROC SORT DATA=PERS(KEEP=DUPERSID AGE SEX EDULEV
EDRECODE)
OUT=PERSX; BY DUPERSID;
RUN;
- PROC SORT DATA=COND; BY DUPERSID;
RUN;
- DATA COND;
MERGE COND (IN=A) PERSX(IN=B); BY DUPERSID;
IF A;
RUN;
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Data from this file can be used alone or in
conjunction with other files for different analytic purposes. Each MEPS panel
can also be linked back to the previous years’ National Health Interview Survey
public use data files. For information on obtaining MEPS/NHIS link files please
see
meps.ahrq.gov/data_stats/more_info_download_data_files.jsp.
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Panel-specific longitudinal files are available for
downloading in the data section of the MEPS Web site. For each panel, the
longitudinal file comprises MEPS survey data obtained in Rounds 1 through 5 of
the panel and can be used to analyze changes over a two-year period. Variables
in the file pertaining to survey administration, demographics, employment,
health status, disability days, quality of care, patient satisfaction, health
insurance, and medical care use and expenditures were obtained from the MEPS
full-year Consolidated files from the two years covered by that panel.
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Cohen, S. B. (1996). The Redesign of the Medical
Expenditure Panel Survey: A Component of the DHHS Survey Integration Plan.
Proceedings of the COPAFS Seminar on Statistical Methodology in the Public
Service.
Cox, B. and Iachan, R. (1987). A Comparison of
Household and Provider Reports of Medical Conditions. Journal of the American
Statistical Association 82(400): 1013-18.
Edwards, W. S., Winn, D. M., Kurlantzick, V., et al.
Evaluation of National Health Interview Survey Diagnostic Reporting. National
Center for Health Statistics, Vital Health 2(120). 1994.
Elixhauser, A., Steiner, C. A., Whittington, C. A.,
and McCarthy, E. Clinical Classifications for health policy research: Hospital
inpatient statistics, 1995. Healthcare Cost and Utilization project, HCUP-3
research Note. Rockville, MD: Agency for Healthcare Research and Quality; 2000.
AHCPR Pub. No. 98-0049.
Ezzati-Rice, T.M., Rohde, F., Greenblatt, J., Sample
Design of the Medical Expenditure Panel Survey Household Component, 1998–2007.
Methodology Report No. 22. March 2008. Agency for Healthcare Research and
Quality, Rockville, MD.
Health Care Financing Administration (1980).
International Classification of Diseases, 9th Revision, Clinical
Modification (ICD-CM). Vol. 1. (Department of Health and Human Services Pub. No
(PHS) 80-1260). Department of Health and Human Services: U.S. Public Health
Services.
Johnson, Ayah E., and Sanchez, Maria Elena. (1993),
“Household and Medical Reports on Medical Conditions: National Medical
Expenditure Survey.” Journal of Economic and Social Measurement, 19,
199-223.
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Appendix 1. Variable-Source Crosswalk
Unique Identifier Variables
| Variable |
Description |
Source1 |
| DUID |
Dwelling unit ID |
Assigned in sampling |
| PID |
Person Number |
Assigned In Sampling |
| DUPERSID |
Person ID (DUID + PID) |
Assigned In Sampling |
| CONDN |
Condition Number |
CAPI Derived |
| CONDIDX |
Condition ID |
CAPI Derived |
| PANEL |
Panel Number |
Constructed |
| CONDRN |
Condition Round Number |
CAPI Derived |
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Medical Condition Variables
| Variable |
Description |
Source1 |
| AGEDIAG |
Age When Diagnosed |
PE section |
| CRND1 |
Has Condition Information In Round 1 |
Constructed |
| CRND2 |
Has Condition Information In Round 2 |
Constructed |
| CRND3 |
Has Condition Information In Round 3 |
Constructed |
| CRND4 |
Has Condition Information In Round 4 |
Constructed |
| CRND5 |
Has Condition Information In Round 5 |
Constructed |
| INJURY |
Was Condition Due To Accident/Injury |
CN01A |
| ACCDNWRK |
Did Accident Occur At Work |
CN07 |
| ICD9CODX |
ICD-9-CM Code For Condition - Edited |
CE05, HS04, ER04, OP09, MV09, HH05, PM09 (Edited) |
| ICD9PROX |
ICD-9-CM Code For Procedure - Edited |
CE05, HS04, ER04, OP09, MV09, HH05, PM09 (Edited) |
| CCCODEX |
Clinical Classification Code - Edited |
Constructed/Edited |
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Utilization Variables
| Variable |
Description |
Source1 |
| HHNUM |
# Home Health Events Assoc. w/ Condition |
Constructed |
| IPNUM |
# Inpatient Events Assoc. w/ Condition |
Constructed |
| OPNUM |
# Outpatient Events Assoc. w/ Condition |
Constructed |
| OBNUM |
# Office-Based Events Assoc. w/ Condition |
Constructed |
| ERNUM |
# ER Events Assoc. w/ Condition |
Constructed |
| RXNUM |
# Prescribed Medicines Assoc. w/ Cond. |
Constructed |
Return To Table Of Contents
Weights and Variance Estimation Variables
| Variable |
Description |
Source1 |
| PERWT13F |
Expenditure File Person Weight, 2013 |
Constructed |
| VARSTR |
Variance Estimation Stratum, 2013 |
Constructed |
| VARPSU |
Variance Estimation PSU, 2013 |
Constructed |
1See the Household Component section under Survey Questionnaires on the MEPS home page for information on the MEPS HC questionnaire sections shown in the Source column (e.g., CN, PE).
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Appendix 4. List of Invalid ICD-9-CM Codes
| Diagnosis Code |
Description |
| 41.4 |
Escherichia coli [E.
coli] infection in conditions classified
elsewhere and of unspecified site |
| 173 |
Other malignant
neoplasm of skin of lip |
| 173.1 |
Other malignant
neoplasm of skin of eyelid, including canthus |
| 173.2 |
Other malignant
neoplasm of skin of ear and external auditory
canal |
| 173.3 |
Other malignant
neoplasm of skin of other and unspecified parts
of face |
| 173.4 |
Other malignant
neoplasm of scalp and skin of neck |
| 173.5 |
Other malignant
neoplasm of skin of trunk, except scrotum |
| 173.6 |
Other malignant
neoplasm of skin of upper limb, including
shoulder |
| 173.7 |
Other malignant
neoplasm of skin of lower limb, including hip |
| 173.8 |
Other malignant
neoplasm of other specified sites of skin |
| 173.9 |
Other malignant
neoplasm of skin, site unspecified |
| 284.1* |
Pancytopenia |
| 286.5 |
Hemorrhagic disorder
due to intrinsic circulating anticoagulants |
| 310.8 |
Other specified
nonpsychotic mental disorders following organic
brain damage |
| 425.1* |
Hypertrophic
obstructive cardiomyopathy |
| 444 |
Embolism and
thrombosis of abdominal aorta |
| 512.8* |
Other spontaneous
pneumothorax |
| 516.3 |
Idiopathic fibrosing
alveolitis |
| 518.5* |
Pulmonary
insufficiency following trauma and surgery |
| 596.8 |
Other specified
disorders of bladder |
| 631 |
Other abnormal product
of conception |
| 718.60* |
Unspecified
intrapelvic protrusion of acetabulum, site
unspecified |
| 747.3 |
Anomalies of pulmonary
artery |
| 793.1* |
Nonspecific (abnormal)
findings on radiological and other examination
of lung field |
| 795.5* |
Nonspecific reaction
to tuberculin skin test without active
tuberculosis |
| 997.4** |
Digestive system
complications |
| 998.0* |
Postoperative shock |
| 999.4 |
Anaphylactic shock due
to serum |
| 999.5** |
Other serum reaction |
| V12.2 |
Personal history of
endocrine, metabolic, and immunity disorders |
| V13.8 |
Personal history of
other specified diseases |
| V19.1 |
Family history of
other eye disorders |
| V40.3* |
Other behavioral
problems |
| Procedure Code |
Description |
| 02.2* |
Ventriculostomy |
Notes:
* These ICD-9-CM codes were discussed at the March
9-10, 2011 ICD-9-CM Coordination and Maintenance Committee meeting and were not
finalized in time to include in the FY 2012 IPPS/LTCH PPS proposed rule. They
were deleted on October 1, 2011.
** The code title has changed from the proposed rule.
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Appendix 5. List of Conditions Asked In Priority Conditions Enumeration Section
- Angina/Angina Pectoris
- Arthritis
- Asthma
- Attention Deficit Hyperactivity Disorder (ADHD)/Attention Deficit Disorder (ADD)
- Cancer/Malignancy
- Chronic Bronchitis
- Coronary Heart Disease
- Diabetes/Sugar Diabetes
- Emphysema
- Heart Attack/Myocardial Infarction (MI)
- High Cholesterol
- Hypertension/High Blood Pressure
- Joint Pain
- Other Heart Disease (not coronary heart disease, angina, or heart attack)
- Stroke/Transient Ischemic Attack (TIA)/Mini-stroke
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