It happens. A friend had a bill for her husbands surgery, from a Dr and Hospital in Arizona threatening to turn it over for collection. It was a bill for over $25,000. She called and asked when this surgery was to have been performed. They informed her that she should know when her husband had the surgery almost 18 months before --She asked how that was possible? Then she told them her husband had been deceased for 15 years, and was wondering if they dug him up to perform the surgery. They, of course didn't believe her so she had to send them a certified death certificate before they would admit it was an error.