Medicare has setup a database that lists contact information (by zip code) for approved suppliers & vendors for a variety of medical supplies, mobility devices, and other durable medical equipment.
On January 1, 2011, Medicare began transitioning to the new competitive bidding program so different areas of the U.S. may require that you purchase certain medical supplies and equipment from a particular vendor. As long as you live in the particular area that the supplier covers, they’ll be able to file a Medicare claim for you.
This only applies to certain products. There may be circumstances that an individual would have to go to several different suppliers if they needed several different medical devices.