If you have medicaid you may have been overcharged. Some North Carolina hospitals are overcharging medicaid up to four times the expected amount for certain procedures, according to an audit released this month by the U.S. Department of Health and Human Services. Audit officials say more than 89-million dollars would have been saved over six years, if hospitals had charged the appropriate amount. They said hospitals are taking advantage of a system in which the state makes special payments for long hospital stays or expensive cases. The audited hospitals were not identified by name in the report. However, some disagreed with the audit's findings, and saying they were based on faulty data.