Since Medicare’s inception in 1966, private health care insurers have processed medical claims for Medicare beneficiaries. Originally these entities were known as Part A Fiscal Intermediaries (FI) and Part B carriers. In 2003 the Centers for Medicare & Medicaid Services (CMS) was directed via Section 911 of the Medicare Prescription Drug Improvement, and Modernization Act (MMA) of 2003 to replace the Part A FIs and Part B carriers with A/B Medicare Administrative Contractors (MACs) in accordance with the Federal Acquisition Regulation (FAR). Learn more about MACs at What is a MAC. Learn more about MAC current events at What’s New.