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Medicare Advantage & Part DSource-backed product
Medicare Advantage & Part D Enrollment
How many people are enrolled in each Medicare Advantage and Part D plan, tracked month by month down to the county level, back to 2006. The core measure of plan size, market share, and enrollment growth or decline.
What Vlada adds: Preserves the publisher data, normalizes schema eras and identifiers, and connects the product to compatible healthcare entities with measured join coverage.
- rows
- 613.7M
- rows
- datasets
- 3
- datasets
- cadence
- monthly
- cadence
- coverage
- 2006-2026
- coverage
Publishers: Centers for Medicare & Medicaid Services
What's inside
MA/Part D enrollment — CPSC county grain
CMS CPSC (Contract/Plan/State/County) monthly MA + Part D enrollment at county grain.
grain: One row per (contract_id, plan_id, state_code, county_fips, month) enrollment count.
612.1M rows
MA/Part D enrollment — plan grain
CMS monthly MA + Part D enrollment at plan grain.
grain: One row per (contract_id, plan_id, month) plan-level enrollment count.
1.4M rows
MA enrollment — monthly contract summary
CMS "Monthly Enrollment by Contract" — member counts per MA/Part D contract per month (enrollment_count).
grain: One row per (contract_id, report_month) — CMS Monthly Enrollment by Contract (member counts). CERTIFIED 2026-06-03.
198.9K rows