Under the new proposal, Medicare would establish more stringent requirements to obtain advanced prosthetics, reduce the role of the prosthetist who creates and maintains prostheses, and eliminate some of the universal codes that all providers use to cover prosthetic care. The proposal could affect the 150,000 amputees in the Medicare system, but advocates worry that its influence could set the standard and the U.S. Department of Veterans Affairs and private insurers would follow suit.