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SEER-Medicaid: Medicaid Data
Medicaid is a program that is jointly funded at the federal and state level that provides health insurance for persons with limited income and/or resources that is administered by the Centers for Medicare & Medicaid Services (CMS).
Personal identifiers for all tumors diagnosed between 1999-2019, as reported to the SEER registries by November 2021, were linked to the CMS Medical Statistical Information System (MSIS) Medicaid Analytic Extract (MAX) Personal Summary (PS) Files (1999-2015*) and the Transformed Medicaid Statistical Information System (T-MSIS) Analytic File (TAF) Demographic and Eligibility (DE) Files (2014-2020*) from all 50 states and the District of Columbia using a deterministic process. Personal identifiers considered were Social Security Number (SSN), date of birth, and sex.
*States transitioned from MSIS to T-MSIS at varying times, therefore, file availability will vary overtime by state. Please refer to this summary table of Medicaid available files by state and year (XLSX, 17 KB). Depending on the research question, investigators will need to decide how to handle these transition years.
