Medicare Beneficiary Identifier (MBI)
Medicare Glossary
The unique 11-character number on your Medicare card that identifies you for Medicare services. The MBI replaced the old Health Insurance Claim Number (HICN) that was based on Social Security numbers.
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This content is for educational purposes only and does not constitute a recommendation of any specific Medicare plan. Benefits, costs, and availability vary by plan and location. For complete information about your Medicare options, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227), TTY: 1-877-486-2048, available 24 hours a day, 7 days a week.
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