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CMS is pleased to announce the availability of Medicaid T-MSIS Analytic Files (TAFs) for calendar years 2017-2018 (Release 1). The research-ready TAFs contain data on Medicaid and Children's Health Insurance Program (CHIP) beneficiary demographics, program enrollment, diagnoses, service use, and payments. They are designed to meet the diverse research needs of the Medicaid and CHIP data user community. Please note, CMS is continuing to work with states to address data quality issues and we anticipate releasing an updated version of the 2017-2018 TAFs (Release 2) in 2021.

The TAFs include 5 annual files, an enrollment file and four claims/billing files. The annual Demographic and Eligibility (DE) file contains demographic, eligibility and enrollment information for all Medicaid and CHIP beneficiaries enrolled for at least one day during each calendar year. The Inpatient (IP) file, Long-Term Care (LT) file, Pharmacy (RX) file, and the Other Services (OT) file contain fee-for-service claims, managed care encounter claims, and per-person-per-month capitated payments for Medicaid and CHIP services.

Data can be obtained for a particular state, group of states, or a national sample. With this release, TAF data are available for the period from 2014 to 2018.  Find more information on the data, including record layouts, on this page that lists all TAF files. To learn how to request TAF data, start here or contact us at or 888-973-7322.