California Code, Health and Safety Code - HSC § 440.20

Within seven days after completion of the patient's itemized bill, every health facility shall provide to the primary attending health care practitioner a copy, upon written request specifying the individual patient, of the complete itemized charges for services rendered by the health facility to the health care practitioner's patient when the primary attending health care practitioner is not employed by the health facility nor is a member of an integrated group practice that provided the health facility services.