108 Medicare Terms Defined

Medicare Glossary

Plain-English definitions for every Medicare term — from ABN to ZIP enrollment. No jargon, no confusion.

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M

Medicare Beneficiary Identifier (MBI)

Medicare Basics

The unique number printed on your red, white, and blue Medicare card, used to identify you for Medicare claims and services. It replaced Social Security numbers on Medicare cards to help protect against identity theft.

Also known as: MBI, Medicare Number

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