The Mamawetan Churchill River Regional Health Authority says it received complaints from two employees in June 2012 and began an investigation.
The complaints were about a nurse working in Sandy Bay, Sask.
In the spring the health authority contacted the RCMP.
Mounties have issued a warrant for the arrest of Michelle Moore, 49, of Marshall Town, Digby County, N. S.
It's alleged that Moore fraudulently claimed call-back overtime for seeing patients on seven occasions.
Police believe Moore is currently living in Nova Scotia.