Grey Bruce Health Services says an investigation has determined a former employee inappropriately accessed the electronic medical records of 246 patients over a seven year period.
The investigation began after four individuals reported concerns about access to personal information in their electronic medical records.
Health service says the individual accessed accessed electronic medical records from January 2008 to September 2015 for no work-related reason and apparently for personal curiosity.
All individuals involved in the privacy breach have been notified and a summary of the investigation has been forwarded to the province's privacy commissioner.
Grey Bruce Health Services has hospitals in Owen Sound, Markdale, Lion's Head, Meaford, Southampton and Wiarton.