{"data":{"id":"us/42-cfr-421.401","jurisdiction":"us","citation":"42 CFR 421.401","heading":"Definitions.","body":"For purposes of this subpart—\nAppropriate MAC means a MAC that has a contract under section 1874A of the Act to perform a particular Medicare administrative function in relation to:\n(1) A particular individual entitled to benefits under Part A or enrolled under Part B, or both;\n(2) A specific provider of services or supplier; or\n(3) A class of providers of services or suppliers.\nMedicare Administrative Contractor (MAC) means an agency, organization, or other person with a contract under section 1874A of the Act.","path":["Title 42—Public Health","CHAPTER IV—CENTERS FOR MEDICARE \u0026 MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES","SUBCHAPTER B—MEDICARE PROGRAM","PART 421—MEDICARE CONTRACTING","Subpart E—Medicare Administrative Contractors (MACs)"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-42.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:11Z","sha256":"b6444ab005d2fa5085895e9337663628ff4a62d8b7dc88525ecf1fd413e0396c","source_id":"us-cfr","stale":true,"prev":"us/42-cfr-421.400","next":"us/42-cfr-421.404"},"notice":"GroundRules: Original legal text. Not legal advice."}