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CMS Medicare Master Beneficiary Summary File (MBSF)
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The Medicare Master Beneficiary Summary File (MBSF) is the Centers for Medicare & Medicaid Serivces's database of record for Medicare Beneficiary enrollment information. It is the authoritative source for Medicare beneficiary information and entitlement.
Scope and Coverage
Smallest Geographic Unit
Address
Years Available
2024 - 2025
Universe
- All states—including the District of Columbia—provide data each month about their Medicaid and Children’s Health Insurance Programs (CHIP) eligibility and enrollment activity.
Spatial Coverage
- National (50 States, DC)
Unit of Observation
Classification(s)