CFR > Title 42 - Public Health > CHAPTER IV—CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES > SUBCHAPTER B—MEDICARE PROGRAM (parts 405 to 426) > PART 421—MEDICARE CONTRACTING > SUBPART E—Medicare Administrative Contractors (MACs) (§421.400 to §421.404) > 421.401—Definitions.

421.401—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.