A Medicare Administrative Contractor (MAC) is a private health care insurer that is contracted with CMS to process Medicare claims for specified jurisdictions under the Medicare program. As part of Medicare Contracting Reform, the number of MAC jurisdictions that process Part A/B claims has been consolidated from 15 to 13. With ongoing changes in contracting reform there will eventually be 10 A/B MAC jurisdictions. 

Former Jurisdiction New Jurisdiction States Contractor Status
1 E California, Hawaii, Nevada, American Samoa, Guam, Northern Marian Islands Noridian Healthcare Solutions, LLC Recompete contract awarded to Noridian on September 20, 2012. Award protest received; COFC denied protest on 4/17/2013. Jurisdiction E was fully implemented September 30, 2013
2 F Alaska, Arizona, Idaho, Montana, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming Noridian Healthcare Solutions, LLC Consolidated with Jurisdiction 3 forming Jurisdiction F. Contract awarded to NAS 8/2011; contract fully implemented February 28, 2012
3 F Alaska, Arizona, Idaho, Montana, North Dakota, Oregon, South Dakota, Utah, Washington, Wyoming Noridian Healthcare Solutions, LLC Contract awarded to NAS 8/2011. Consolidated with Jurisdiction 2 forming Jurisdiction F; contract fully implemented February 28, 2012
4 H Arkansas, Colorado, New Mexico, Oklahoma, Texas, Louisiana, Mississippi Novitas Solutions, Inc. Consolidated with Jurisdiction 7 forming Jurisdiction H. Contract awarded to Highmark Medicare Services (now called Novitas Solutions, Inc.) on 11/9/11; Award protest received; GAO denied the protest on 3/1/12. Fully implemented November 2012
5 G Iowa, Kansas, Missouri, Nebraska Wisconsin Physician Service Insurance Corporation (WPS) Recompete contract awarded to WPS on July 31, 2012. Implementation complete. To be consolidated with Jurisdiction 6 in several years (and renamed Jurisidiction G)
6 G Illinois, Minnesota, Nebraska National Government Services, Inc. Contract awarded to NGS 9/27/2012. Award protest received; GAO denied both protests 1/16/2012. Jurisdiction 6 was fully implemented September 7, 2013
7 H Arkansas, Colorado, New Mexico, Oklahoma, Texas, Louisiana, Mississippi Novitas Solutions, Inc. Consolidated with Jurisdiction 4 forming Jurisdiction H. Contract awarded to Highmark Medicare Services (now called Novitas) on 11/09/11; Award protest received; GAO denied the protest on 03/01/12. Fully implemented November 12, 2012
8 I Indiana, Michigan Wisconsin Physician Service Insurance Corporation (WPS) Contract awarded to WPS 09/30/11; Award protest received; GAO denied protest 01/30/2012; implementation completed on 08/20/2012. To be consolidated with J15 in several years
9 N Florida, Puerto Rico, U.S. Virgin Islands First Coast Service Options, Inc. Recompete contract was awarded to First Coast Service Options, Inc. on February 11, 2014. The new contract effective date is February 14, 2014.
10 J Alabama, Georgia, Tennessee Cahaba Government Benefit Administrators Recompete in progress as of 2/12/2014
11 M North Carolina, South Carolina, Virginia, West Virginia (excludes Part B for the counties of Arlington and Fairfax and the city of Alexandria in Virginia) Palmetto Government Benefit Administrators Fully implemented June 2011
12 L Delaware, District of Columbia, Maryland, New Jersey, Pennsylvania (includes Part B for counties of Arlington and Fairfax and the city of Alexandria in Virginia) Novitas Solutions, Inc. Recompete contract awarded to Novitas Solutions, Inc. on September 17, 2012. GAO resolved the protest on April 16, 2013. Jurisdiction L contract was fully implemented July 29, 2013
13 K Connecticut, New York, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont National Government Services, Inc. Recompete contract awarded to NGS on February 22, 2013. Jurisidiction K was fully implemented October 25, 2013
14 K Connecticut, New York, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont National Goverment Services, Inc. Recompete contract awarded to NGS on February 22, 2013. JK was fully implemented October 25, 2013
15 I Kentucy, Ohio CGS Administrators, LLC Fully implemented October 17, 2011. To be consolidated with Jurisdiction 8 in several years