Medicare Administrative Contractor
A MAC decision applies in its jurisdiction. An NCD applies nationwide. This site does not submit claims to a MAC.
Source: CMS, What is a MAC. Page read October 14, 2026.
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Definition · Claims processing and coverage determinations
Medicare Administrative Contractor
A Medicare Administrative Contractor is a company CMS hires to process Medicare claims in a region. The contractor pays fee-for-service claims and can publish Local Coverage Determinations for its area. It is not a Medicare Advantage plan. See the Local Coverage Determination entry.
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Questions
Medicare Administrative Contractor, answered
Does a MAC run Medicare Advantage?
No. A MAC pays Original Medicare fee-for-service claims. A Medicare Advantage organization is a separate contract.