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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

Privacy Level
Research Identifiable Files