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Department of Employee Trust Funds
March 9, 2018

Medicare Numbers Changing

The Centers for Medicare and Medicaid Services has begun transitioning to new Medicare Beneficiary numbers and moving away from using health insurance claim numbers as a way to identify participants. Medicare participants will receive a new Medicare card in the mail from the CMS.* If you participate in the State of Wisconsin Group Health Insurance Program and are on Medicare, you do not have to do anything -- we will update our system to reflect this Medicare number change. However, any time you change your group health insurance program coverage – and use a paper application to do so – your new Medicare number will be required on the application.

*This CMS process may take up to a year to complete. For more information, including the state-by-state Medicare card mailing schedule, visit

For More Information
FAQs: Medicare Numbers

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