Okla. Stat. tit. 36, § 6935

Basic health care services as herein provided may be furnished to enrollees of health maintenance organizations outside this state only in accordance with the laws of the state or of the United States that govern the provision of such services in the state or place concerned; provided, that an enrollee may be reimbursed directly for emergency health care expenses incurred by the enrollee while temporarily outside the state, when such expenses would have been provided under the enrollee's program had the enrollee been within the state. Such reimbursement made by a health maintenance organization shall not be construed as an indemnity and no health maintenance organization shall be an insurer or make any contract of insurance of any kind whatsoever.