Northern Ireland health fraud 'costs up to £250m'
2 October 2013 Last updated at 13:37 BST
Fraud could be costing the Northern Ireland health service up to £250m per year.
Investigators say they are dealing with a range of offences, from people obtaining fraudulent prescriptions to consultants claiming unworked hours.
To combat the problem, the Department of Health is launching a major counter fraud campaign for the month of October.
BBC Northern Ireland health correspondent Marie-Louise Connolly reports.