New Medicare Card: MBI Look-up Tool via MAC

All Medicare Administrative Contractor (MAC) secure portal Medicare Beneficiary Identifier (MBI) look-up tools are ready for use. If you don’t already have access, sign up for your MAC’s portal to use the tool.

Submit four data elements about your patient through the tool, and we will return the MBI if we have already mailed the new Medicare card. Medicare is mailing new cards in phases by geographic location. For more information about the MBI, read the MLN Matters® Special Edition Article.

Medicare is currently mailing new cards to people who:

• Live in Alaska, American Samoa, California, Delaware, District of Columbia, Guam, Hawaii, Maryland, Northern Mariana Islands, Oregon, Pennsylvania, Virginia, and West Virginia
• Get Railroad Retirement Board benefits
• Are newly entitled to Medicare