A group of cardiac monitoring companies and an executive have agreed to pay a combined $13.45 million to settle allegations that they improperly overbilled Medicare, the U.S. Department of Justice announced Monday.

According to the Justice Department, Spectocor and its owner, Joseph Bogdan, as well as Medi-Lynx Cardiac Monitoring and its current majority owner, Medicalgorithmics SA, allegedly violated the False Claims Act by billing Medicare for more expensive levels of cardiac monitoring services than were actually requested by the ordering physician.