Definitions.

For purposes of this subpart— Appropriate MAC means a MAC that has a contract under section 1874A of the Act to perform a particular Medicare administrative function in relation to: (1) A particular individual entitled to benefits under Part A or enrolled under Part B, or both; (2) A specific provider of services or supplier; or (3) A class of providers of services or suppliers. Medicare Administrative Contractor (MAC) means an agency, organization, or other person with a contract under section 1874A of the Act.