CMS Proposes Expanding Prior-Authorization Requirements-thegraysheet: CMS wants to require prior authorization for Medicare coverage of certain durable medical equipment, prosthetics, orthotics, and supplies items that are frequently subject to unnecessary use, the agency explains in a May 28 proposed rule (PDF). CMS is also proposing to expand its existing prior-authorization demonstration program for power mobility devices to 12 additional states, and two launch two addition prior-authorization demonstration programs.