Gerald Quindry was facing a quandary. The 73-year-old retired engineer received a statement last year that Medicare, his health insurance provider, had been billed $15,500 for urinary catheters - but his doctor had never ordered them, and Quindry never wanted nor received them. Quindry complained to Medicare. But he said the representatives seemed nonplussed by his complaint, and he could find little information about the incident himself beyond news reports of catheter-related fraud in the government program.