We are halfway through the transition period that began April 1, 2018:

  • To ensure your Medicare clients continue to get care, they can use either the former Social Security number-based Health Insurance Claim Number or the new alpha-numeric Medicare Beneficiary Identifier (MBI) for all Medicare transactions through December 31, 2019.
  • Beginning January 1, 2020, they must use the MBI on all Medicare transactions with a few exceptions

About the MBI:

  • MBIs are random and use numbers 0-9 and uppercase letters, except for S, L, O, I, B, and Z. Medicare excludes these letters to avoid confusion when differentiating between these letters and numbers (e.g., between “0” and “O”). Read MLN Matters® Article New MBI Get It, Use It for helpful information, including what to do if an MBI changes.
  • Learn about Getting MBIs.
  • Learn about Using MBIs.

If your clients accidentally threw away their new Medicare card, ask them to call 1-800-MEDICARE and request a replacement. Your clients can also sign into MyMedicare.gov to print an official card. They must create an account if they do not already have one.

For More Information: