As required by Section 911 of the Medicare Prescription Drug, Improvement and Modernization Act of 2003 (MMA), CMS is replacing its current claims payment contractors, previously known as Fiscal Intermediaries or Carriers, with new contract entities called Medicare Administrative Contractors (MACs). 

The responsibility for paying Medicare Part A and Part B claims is divided into 15 jurisdictions, known as A/B MAC Jurisdictions. Highmark Medicare Services, Inc. was awarded the contract for Jurisdiction 12 in October 2007. Jurisdiction 12 encompasses Delaware, District of Columbia, Maryland, New Jersey and Pennsylvania. In January 2009, Highmark was awarded the contract for Jurisdiction 15, which encompasses Ohio and Kentucky, with the intent of assuming full claims responsibility by March 2010.


A complete explanation of A/B MAC Jurisdictions and the contracting process can be accessed at the following link.