Three additional doctors have been charged in three new cases for their roles in a 15-year-long health care fraud scheme that involved more than $40 million in illegal kickbacks paid to doctors and other medical professionals in exchange for referring thousands of patients who received spinal surgeries. As a result of the kickback scheme, more than $580 million in fraudulent bills were submitted, mostly to California’s worker compensation system.

David Hobart Payne, 60, an orthopedic surgeon who lives in Irvine, is scheduled to be arraigned in United States District Court on charges of conspiracy, honest services fraud, and using an interstate facility to aid in unlawful activity. A five-count superseding indictment returned by a federal grand jury on April 25 alleges that Payne was bribed approximately $450,000 to steer more than $10 million in kickback-tainted surgeries to Pacific Hospital of Long Beach.

Jeffrey David Gross, 52, an orthopedic surgeon who resides in Dana Point and Las Vegas, Nevada, appeared in federal court and pleaded not guilty to charges contained in a 14-count indictment returned earlier this year by a federal grand jury. Gross, who faces charges of conspiracy, honest services mail fraud and honest services wire fraud, was ordered to stand trial on August 7. The indictment alleges that Gross made at least $622,000 in exchange for performing and/or referring more than $19 million in kickback-tainted surgeries to Pacific Hospital.

In the third indictment being announced today, Lokesh Tantuwaya, 51, who maintains residences in Rancho Santa Fe and Rock Springs, Wyoming, was charged in February by a federal grand jury. The 13-count indictment charges Tantuwaya with conspiracy, honest services fraud, and using an interstate facility to aid in unlawful activity. Tantuwaya, who pleaded not guilty in April, has been ordered to stand trial on November 6. The indictment alleges that Tantuwaya received approximately $3.2 million in kickbacks for referring and/or performing $38 million in surgeries to Pacific Hospital.

The kickback scheme centered on Pacific Hospital of Long Beach, which specialized in surgeries, especially spinal and orthopedic procedures.

The owner of Pacific Hospital, Michael D. Drobot, conspired with doctors, chiropractors and marketers to pay kickbacks in return for the referral of thousands of patients to Pacific Hospital for spinal surgeries and other medical services paid for primarily through the California workers’ compensation system. During its final five years, the scheme resulted in the submission of over $500 million in fraudulent medical bills. To date, nine defendants have been convicted for participating in the kickback scheme.

If they were to be convicted of the charges in the indictments announced today, Payne, Gross and Tantuwaya would face potential sentences of decades in federal prison.