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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:

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:

    • Visit the top Frequently Asked Questions (FAQs) about MACs or;
    • Send your question through Submit a Request
      • Click "Start"
      • Fill in all required (*) fields > "Name, Email, and Date"
      • Select topic > “Medicare Administrative Contractor Questions
      • Enter your "Question/Comment"
      • Click "Preview"
      • Click "Submit"