Seems it’s not very hard to defraud the Medicare program, according to this U.S. News & World Report item:

In the fiscal year ending March 2007, Medicare made about $1 billion in improper payments on canes, prosthetic devices, wheelchairs, and other equipment. Medicare says it’s implementing new billing oversight requirements for medical suppliers, according to Bloomberg.

The more these programs grow, the more opportunities there are for mischief.