Tex. Health & Safety Code § 265.011
The commissioners court of a county and the governing body of a municipality in that county may jointly appoint a board of managers to establish, build, equip, maintain, and operate one or more hospitals for the care and treatment of the sick, infirm, or injured.
Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.