Where do I find my MBI number?


Editorial team Published on

You can find your Medicare Beneficiary Identifier (MBI) or Medicare number by logging into your account on Medicare.gov.

Where to Find Your MBI

  • Your Physical Card: The 11-character code is printed directly on your Medicare card.
  • Online Accounts: Log into your Social Security Administration Account to view or download your benefit verification letter, which lists your Medicare number. You can also check your official online Medicare Account.
  • Paper Notices: Check past Medicare Summary Notices (MSNs) or official mail sent by Medicare or Social Security.
  • By Phone: Call Medicare directly at 1-800-MEDICARE (1-800-633-4227) to get help retrieving your number.
  • For Providers: Healthcare providers can look up patient MBI numbers securely using their local Medicare Administrative Contractor (MAC) portal or eligibility software.