Medicare Prescription Drug Improvement and Modernization Act (MMA) of 2003 was passed by Congress in which Section 911 required the Centers for Medicare and Medicaid Services (CMS) to replace the fiscal intermediary and carrier contracts for the administration of Medicare benefits with Medicare administrative contractors (MACs). Its intention is to improve Medicare’s administrative services to beneficiaries and health care providers and to bring standard contracting principles to Medicare (i.e., competition and performance incentives). In this reform, the United States will be divided into 15 A/B jurisdictions and each A/B jurisdiction will be assigned to one MAC who administers both Part A and Part B claims. Also see Medicare administrative contractor (MAC) and A/B jurisdictions .