The owner of one of California's largest chains of pain management clinics has agreed to pay nearly $11.4 million to California, Oregon, and the federal government to settle allegations of Medicare and Medicaid fraud.

The U.S. Department of Justice and the states' attorneys general say Francis Lagattuta, a physician, and his Lags Medical Centers performed — and billed for — medically unnecessary tests and procedures on thousands of patients over more than five years. It was "a brazen scheme to defraud Medicare and Medicaid of millions of dollars by inflicting unnecessary and painful procedures on patients whom they were supposed to be relieving of pain," Phillip Talbert, U.S. attorney for the Eastern District of California, said in a statement this month.