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Medicare Administrative Contractors

Medicare Administrative Contractors (MACs) for your state will be the primary source of contact in the process.

Here is a list of MACs by state and region:

https://www.cms.gov/Medicare/Medicare-Contracting/Medicare-Administrative-Contractors/Downloads/MACs-by-State-June-2019.pdf

Medicare Administrative Contractors (MACs) are private health care insurers that has been awarded a geographic jurisdiction by the Centers for Medicare and Medicaid Services (CMS) to process Medicare Part A and Part B medical care and mental health claims for Medicare Fee-For-Service (FFS) beneficiaries. CMS relies on a network of MACs to serve as the primary operational (intermediary) contact between the Medicare FFS program and the providers enrolled in the program. MACs are multi-state, regional contractors responsible for administering both Medicare Part A and Medicare Part B claims.

Key services that MACs perform include:

  • Enrolling providers in the Medicare FFS program
  • Processing Medicare FFS claims
  • Handling provider reimbursement services
  • Responding to provider inquiries
  • Educating providers about Medicare FFS billing requirements
  • Establishing local coverage determinations (LCD’s)

Providers enroll in Medicare through their designated MAC. You can find your designated MAC and their contact information and mailing address here: https://www.cms.gov/medicare/provider-enrollment-and-certification/medicareprovidersupenroll/downloads/contact_list.pdf