Okla. Stat. tit. 56, § 201

The Department of Public Welfare is hereby authorized to procure group hospitalization and medical care insurance in any of the forms customarily issued by any company or companies, association or associations authorized to do business in the State of Oklahoma for all persons eligible to receive old age assistance under the provisions of subsection (a) of Section 4 of the Oklahoma Social Security Act, at a rate not to exceed the amount of the actual costs.