Don't knock the "providers", as a group. Sure, there are some who abuse the system -- but it's not the ordinary doctors, hospitals or services. It's a venal few -- I'd wager that 90% of the fraud is traceable to 2% of the providers.
That said, have you ever tried to reconcile a Medicare statement?
What you'll find is absolute chaos -- a total disconnect between real costs and arbitrary payments. The system defies rational accounting procedures; instead, it is an incoherent fabrication that nobody truly understands. Including those who are in charge of administering it -- either on the professional side or the government bureaucracy.
Like most government programs, it's a structure tailor-made for stealing.
Under the Ryan plan, with government vouchers available for the purchase of private health insurance, thus placing insurance companies in charge of administering the program, I would expect Medicare fraud to immediately drop by 90%.
Sorry, this was 'ordinary' doctors, hospitals and services.