Okla. Stat. tit. 36, § 36-2618: Limited application

This article shall not apply to any corporation operating or

maintaining a hospital service plan or medical service plan,

participation in which is limited to its employees and the employees

of other persons or corporations with which such corporation may

have contracted to provide such services; provided such contract is

not entered into for the purpose of evasion of the terms and spirit

of this Code. As used in this section, the term "employees" shall

include members of the families of employees.