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The MBSF base segment includes beneficiary enrollment information, (A/B/C/D). Medicare Advantage (Part C) and the Prescription Drug Program (Part D) plan enrollment information is included.

  • What does this file include? (variable highlights)
    • State, county annual SSA codes
    • State, county monthly FIPS codes
    • Zip code, State and County
    • Date of birth, date of death
    • Race
    • Reason for entitlement
    • Monthly enrollment for each part of the Medicare program, A/B/C/D
    • Dual eligible status
    • Part C plan and enrollment information
    • Part D plan and enrollment information
    • Part D low income cost sharing

    Special Considerations:

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Research Identifiable Files