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We frequently update our articles to reflect the latest changes and updates to Medicare, and strongly recommend you visit this article at link below to confirm you have the latest version.
Printed Date: 9/22/2015
The Medicare Beneficiary Identifier (MBI) uses numbers 0–9 and all uppercase letters except for S, L, O, I, B and Z. We exclude these letters to avoid confusion when differentiating some letters and numbers (e.g., between “0” and “O”). Read MLN Matters Article New MBI: Get It, Use It (PDF, 213 KB) for other helpful information, such as how to get the MBI, and what to do if an MBI changes.
Protect your patients’ identities by using the MBI now. We will reject claims you submit with the Health Insurance Claim Number (HICN), with a few exceptions, and reject all eligibility transactions starting January 1, 2020.
Don’t have an MBI?
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Last Updated: 10/04/2019