Okla. Stat. tit. 12, § 12-3009: Medical bills - Identification

Upon the trial of any civil case involving injury, disease or

disability, the patient, a member of the patient’s family or any

other person responsible for the care of the patient, shall be a

competent witness to identify doctor bills, hospital bills,

ambulance service bills, drug bills and similar bills for expenses

incurred in the treatment of the patient upon a showing by the

witness that such bills were received from a licensed practicing

physician, hospital, ambulance service, pharmacy, drug store, or

supplier of therapeutic or orthopedic devices, and that such

expenses were incurred in connection with the treatment of the

injury, disease or disability involved in the subject of litigation

at trial. Such items of evidence need not be identified by the

person who submits the bill, and it shall not be necessary for an

expert witness to testify that the charges were reasonable and

necessary.