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Claims & Spending
CMS Data Research
16+ CMS research feeds: Medicare Advantage and Part D enrollment, plan, and crosswalk history since 2001. Query-ready on Snowflake and Databricks.
16+ research feeds, history since 2001
Daily checks; feeds refresh as CMS publishes
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About this product
The CMS Data Research Dataset is a comprehensive collection of CMS data feeds from cms.gov/data-research, with history dating back to 2001 — enrollment by contract and plan, Part-D enrollment by geography, MA service areas, plan crosswalks, and more, each delivered as a view with aligned, properly typed attributes.
Ideal for longitudinal healthcare policy analysis, enrollment trend studies, and plan-level research on Medicare programs. New feed files load automatically as CMS publishes them, with daily monitoring and automated quality checks so bad data never reaches you.
Questions it answers
How have enrollment counts by plan and contract trended since 2001?
Where are Part-D eligible and enrolled individuals concentrated geographically?
How do plan crosswalks map contracts across years?
Resources