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 CMS.gov

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 CMS.gov

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) (PDF) about MACs or;
• Click on this link to Submit a Question/Comment to CMS
  • Fill in all required fields:  
    • Name
    • Email Address
    • Date (mm/dd/yyyy)
    • Topic:  “Medicare Administrative Contractor Questions”
    • Enter your "Question/Comment"
    • Click the Blue → Button