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Claims & Spending
CMS Data Research
CMS research data feeds from cms.data.gov — enrollment, plan, and crosswalk history back to 2001.
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.data.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, and new research feeds are added as they appear — 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