TOMAH, Wis. (WTAQ) - Up to 600 patients at a hospital in Tomah might have been charged for medicines they didn’t buy. Officials at Tomah Memorial Hospital are not sure about that yet. But they’re checking into it, after an emergency room nurse was accused of fraudulently obtaining narcotics, while improperly accessing the names-and-addresses of patients.

54-year-old Dianna Peth of Tomah is charged with the felony diversion of narcotics. She’s due in Monroe County Circuit Court on May 3rd, when a judge will decide if there’s enough evidence to order a trial. Hospital CEO Phil Stuart said no actual medical information was disclosed to anyone – and the only negative impact on the affected patients might have been an incorrect drug billing.

He said the data breach took place because, “the nurse misused her legitimate access to protected health information.”