Medical debt is the second leading cause of personal bankruptcy in the U.S. And billing errors add to the problem. For example: mistakes made on the number of days actually spent in the hospital. Ask for an itemized bill from your hospital and check the dates. Most hospitals will charge for admission day but not for the day of discharge. And there's an error called "up-coding." Hospitals sometimes shift the charge for a lower cost medication to one that's more expensive, for example, your doctor orders a generic drug but you're charged for a brand name. There are professional bill reviewers that can help you decipher your hospital bill.