Prosecutors in California say more than two dozen doctors, pharmacists and medical business owners have been charged in a multimillion-dollar scheme to bilk workers compensation insurance by prescribing unnecessary treatments and tests.

The Orange County district attorney's office on Thursday said Tanya Moreland King and her husband Christopher King of Beverly Hills owned a trio of medical billing and management companies behind the conspiracy that paid defendants $23 million.

A call seeking comment from the Kings' company rang unanswered.

Prosecutors say the couple partnered with a compound pharmacy and doctors to prescribe unnecessary creams to patients and overbill insurers.

Authorities say the companies also overbilled for pain medication and ordered unnecessary urine tests.

Authorities say more than 13,000 patients and two dozen insurance carriers were affected.