Mont. Code Ann. § 37-10-104

All agencies of the state and its subdivisions administering relief, public assistance, public welfare assistance, social security health insurance, or other health service under the laws of this state shall accept the services of licensed optometrists for any service covered by their licenses rendered to any person receiving benefits from said agents or bodies and shall pay for such services in the same manner as other ocular practitioners rendering similar services. None of the governmental agencies or agents, officials, or employees thereof, including the public schools, shall, in the performance of their duties, discriminate in any way among licensed ocular practitioners.