HATTIESBURG, Miss. (AP) — A nurse practitioner is the latest Mississippian indicted on health care fraud charges, in schemes that federal officials say soaked hundreds of millions from insurers.

Susan Perry, who ran a Biloxi clinic, was indicted Oct. 18 on 13 counts, including conspiracy, wire fraud, improperly prescribing drugs and lying to investigators.

Perry pleaded not guilty last week in Hattiesburg before U.S. Magistrate Judge John Gargiulo and is free on $25,000 bail. She's set for trial Dec. 18.

The indictment says that from 2013 through 2016, Perry took more than $50,000 in kickbacks to prescribe unneeded medications handmade by a Hattiesburg compounding pharmacy. Her acts are alleged to have cost a federal military health insurer $3.3 million.

Federal officials say more than $400 million was bilked from insurers by multiple pharmacies.