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Medicare Administrative Contractors (MACs), also known as Medicare carriers, are regional companies that oversee the administration and processing of Medicare Part A and Part B policies, or Durable Medical Equipment (DME) policies. MACs serve as the primary point of contact for Medicare providers (physicians), handling information around coverage, billing, and enrollment. MACs have the authority to set local coverage policies for their districts.

History
In 2006 CMS began to award claims processing contract (Part A and B) through competitive bid procedures, and 15 A/B MACs were developed through the initial bidding series. Through the initial series of procurements, Medicare’s claims processing operations realized the opportunity for significant savings by consolidating state workloads and efficiencies gained through integrating Part A and Part B functionality. CMS is also moving to consolidate smaller A/B MACs to form larger MAC jurisdictions. By 2016, CMS plans to consolidate A/B jurisdictions to 10.

Jurisdictions
CMS A/B Jurisdictions Map (15 jurisdictions) CMS Consolidated A/B Jurisdictions Map (10 jurisdictions)

The following table summarizes key information about the A/B MACs :