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Major Eligibility Group Information for Medicaid and CHIP Beneficiaries by Year

Metadata Updated: June 27, 2024

This data set presents annual enrollment counts of Medicaid and CHIP beneficiaries by major eligibility group (children, adult expansion group, adult, aged, persons with disabilities, or COVID newly-eligible). There are three metrics presented: (1) the number of beneficiaries ever enrolled in each major eligibility group over the year (duplicated count); (2) the number of beneficiaries enrolled in each major eligibility group as of an individual’s last month of enrollment (unduplicated count); and (3) average monthly enrollment in each major eligibility group.

These metrics are based on data in the T-MSIS Analytic Files (TAF). Some states have serious data quality issues, making the data unusable for calculating these measures. To assess data quality, analysts used measures featured in the DQ Atlas. Data for a state and year are considered unusable or of high concern based on DQ Atlas thresholds for the topic Eligibility Group Code. Please refer to the DQ Atlas at for more information about data quality assessment methods.

Some cells have a value of “DS”. This indicates that data were suppressed for confidentiality reasons because the group included fewer than 11 beneficiaries.

Access & Use Information

Public: This dataset is intended for public access and use. License: us-pd

Downloads & Resources


Metadata Created Date March 29, 2023
Metadata Updated Date June 27, 2024
Data Update Frequency R/P10Y

Metadata Source

Harvested from

Additional Metadata

Resource Type Dataset
Metadata Created Date March 29, 2023
Metadata Updated Date June 27, 2024
Publisher Centers for Medicare & Medicaid Services
Identifier bffd757a-3ae9-42fc-809a-820c2919496b
Data First Published 2023-03-28
Data Last Modified 2024-01-05
Category Enrollment
Public Access Level public
Data Update Frequency R/P10Y
Bureau Code 009:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id c3275ea9-7cbe-4c66-bc69-c7616043fe46
Harvest Source Id 651e43b2-321c-4e4c-b86a-835cfc342cb0
Harvest Source Title
Homepage URL
Program Code 009:000
Source Datajson Identifier True
Source Hash ba891abbd0bb22cb3f09c6dec472f02e4abbdfb9ad376f4d2cafc7bca9330cdb
Source Schema Version 1.1

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