Contact Us

Contact Us

If you are a Medicare Fee-for-Service (FFS) provider and you have any question about provider enrollment, such as:

  • enrolling, changing your address or opting out of the Medicare FFS program
  • where to mail your application
  • your National Provider Identifier (NPI) or Provider Transaction Access Number (PTAN)
  • revalidation

Visit the Medicare Provider-Supplier Enrollment website on


If you are a Medicare FFS provider and you have any other question, such as:

  • how to contact a Medicare Administrative Contractor (MAC)
  • claims or coverage issues

Contact your MAC -- You can find your MAC by visiting the Contractor Directory – Interactive Map on


If you are a Medicare beneficiary and have a question about Medicare, such as:

  • how to sign up for Medicare/change plans
  • Medicare cost, coverage, or supplement insurance (Medigap)

Visit the Medicare website or call 1-800-Medicare


If you have a question specifically related to the content of this Medicare Administrative Contractor (MAC) website that was not covered above:


Page Last Modified:
09/06/2023 08:09 PM