The California state medical board is trying to revoke or suspend the license of the San Diego Chargers head team doctor, citing evidence he committed acts of gross negligence in his care of three patients in 2007 and 2010.

The new medical board complaint comes less than two months after the board reprimanded Chao for failing to disclose a 2007 drunken-driving conviction on state forms as required. He is challenging that ruling in San Diego Superior Court.

The new complaint requests a hearing on Chao's license to practice medicine and the revocation or suspension of that license. Such cases sometime take a year or more to adjudicate.