Okla. Stat. tit. 36 § 2616
The provisions of this article apply only to not-for-profit hospital service and indemnity and medical service and indemnity corporations and such corporations shall be governed by this article to the extent provided herein. Such corporations shall be exempt from all other provisions of the insurance laws of this state except that the provisions of Articles 1 (Scope of Title), 3 (Insurance Department and Insurance Commissioner), 12 (Unfair Practices and Frauds), 15 (Assets and Liabilities), 16 (Investments), 16A (Subsidiaries of Insurers), 17 (Administration of Deposits), 18 (Supervision and Conservatorship of Insurers), 19 (Rehabilitation and Liquidation) and the provisions of Sections 624 through 626 of this title and 628 through 631 of this title shall apply to such corporations to the extent that such provisions are not in conflict with the provisions of this article. No law relating to insurance hereafter enacted shall apply to such corporations unless they be expressly designated therein.
Okla. Stat. tit. 36, § 2616