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Medicare Beneficiary Identifier (MBI)

Every person with Medicare has been assigned a Medicare Beneficiary Identifier (MBI) and issued a new Medicare card. The MBI is confidential and should be protected as Personally Identifiable Information.

Effective January 1, 2020: The MBI is required for all transactions submitted to Medicare including (not all inclusive)

CGS encourages suppliers to use the MBI for all workloads. However, there are a few exceptions when you can use either the HICN after January 1, 2020, if you are unable to obtain the MBI:

How to Obtain the MBI:

Claim Submission when the MBI Changes:

The MBI may be changed due to a beneficiary or authorized representative request, or CMS may initiate the change. Refer to "What to Do If the MBI Changes."

Using the old or new MBIs in relation to claim submissions:

There are a few exceptions when you can use either the HICN or MBI on or after January 1, 2020:

CGS Resources:

myCGS MBI Lookup Tool

Use myCGS to look up any Medicare beneficiary's MBI, regardless of where they live. To find MBIs in the portal, your Medicare beneficiaries must provide their first and last name, date of birth an SSN.

DME Medicare Beneficiary Identifier (MBI) Converter for the IVR

The Interactive Voice Response (IVR) system requires you enter your patient's name and Medicare number during the beneficiary validation process. Use this tool to convert the patient's MBI to the corresponding numbers on your telephone key pad.

What to Do If the MBI Changes

When checking eligibility using the myCGS portal or the Interactive Voice Response (IVR) and you receive error message "Invalid MBI", your patient's MBI may have changed.


CMS Resources

CMS New Medicare CardsExternal Website

New Medicare Beneficiary Identifier (MBI) Get It, Use ItExternal PDF [MLN Matters SE18006]

Last updated: September 2020

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