The Medicare Modernization Act mandated that the Centers for Medicare and Medicaid Services (CMS) establish geographic regions for the implementation of the Medicare Part D prescription drug plans (PDP) and the Medicare Advantage (MA) Plans. Accordingly, CMS established 34 PDP regions made up of the 50 states and the District of Columbia. In addition, CMS also established 5 separate PDP regions for the United States Territories.
Please click here for a complete list of all the 34 PDP regions on this site
In addition, CMS established 26 MA regions. Some of the MA regions are comprised of single states, while others MA regions are composed of more than one state.
The 26 Medicare Advantage or MA regions and do not overlap with the PDP regions. Here is a list of the Medicare Advantage regions: