• 2017-2018 Medicaid and CHIP Data Now Available - (posted 09/16/20)

    CMS is pleased to announce the availability of the 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 ResDAC at 888-973-7322.

  • Medicare Web Tables and Web Charts updated with 2018 data - (posted 07/08/20)

    CMS receives numerous requests for data which are used to develop aggregated statistics, charts and graphs. The CCW's Medicare Web Tables and Web Charts have been updated and are now available with data for years 2009 - 2018.

  • Encounter Data - (posted 05/28/20)

    Medicare Advantage (Part C) Encounter Data Research Identifiable Files (RIFs) for Year 2017 are now available. See the Record Layout and User Guide for file details. These files are created from data submitted to CMS by Medicare Advantage Organizations (MAOs) that provide services to beneficiaries under the Medicare Part C benefit.

  • New Medicaid and CHIP Data Now Available - (posted 11/07/19)

    The research-ready T-MSIS Analytic Files (TAFs) contain data on Medicaid and Children's Health Insurance Program (CHIP) beneficiary demographics, program enrollment, service use, and payments. In consultation with Medicaid policy and data subject matter experts, they were designed to meet the diverse research needs of the Medicaid and CHIP data user community. As the next generation of research-ready national data on these critical programs, they replace the Medicaid Analytic eXtract (MAX) files. The TAFs currently include 5 files, an enrollment file and four claims 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), Pharmacy (RX), and 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, organized by service month.

    CMS is continuing to work with States to address data quality issues. As new versions of these files become available, they will be announced on The Research Data Assistance Center (ResDAC) website.

  • Sickle Cell Disease (SCD) Indicator now available in the CCW - (posted 06/19/19)

    Algorithm and reference documentation is available for a new CCW sickle cell disease (SCD) indicator for use with Medicare and Medicaid administrative claims data.

  • Medicare Risk Score Files - (posted 07/30/18)

    Medicare Risk Score Research Identifiable Files (RIFs) for Payment Year 2014 (PY14) are now available.  See the Record Layout and User Guide for file details. Risk scores are used to adjust payments to Medicare Advantage plans to account for differences in relative costs among plan enrollees.

  • Updated National Death Index (NDI) Data - (posted 04/27/18)

    NDI Cause of Death Information from 1999-2016 for Medicare beneficiaries and 1999-2013 for Medicaid recipients is now available. See the Record Layout and Codebook for more details.

  • Introduction to CCW - Video - (posted 05/07/15)

    View the new Chronic Conditions Data Warehouse informational video to learn how you can… Access… Analyze… and Aggregate… All the data you need… Like never before.

  • CMS Virtual Research Data Center - (posted 11/12/13)

    The CMS Virtual Research Data Center (VRDC) is an alternative solution for accessing and analyzing CMS data for research purposes. To learn more about getting data for your research, view the CMS VRDC FAQs and visit the ResDAC website.