Understanding the Medicare Beneficiary Identifier (MBI) Format
https://www.cms.gov/medicare/new-medicare-card/understanding-the-mbi-with-format.pdf
WEBMBIs are numbers and upper-case letters. We use numbers 1-9 and all letters from A to Z, except for S, L, O, I, B, and Z. If you use lowercase letters, our system will convert them to uppercase letters. How does the MBI look on the card? The MBI has letters and numbers. Here’s an example: 1EG4-TE5-MK73 • The MBI’s 2 nd, 5 th, 8 th, and 9 th
DA: 90 PA: 59 MOZ Rank: 55