Tex. Lab. Code § 413.042
(a) A health care provider may not pursue a private claim against a workers' compensation claimant for all or part of the cost of a health care service provided to the claimant by the provider unless:
Acts 1993, 73rd Leg., ch. 269, Sec. 1, eff. Sept. 1, 1993.
Acts 2005, 79th Leg., Ch. 265 (H.B. 7), Sec. 3.248, eff. September 1, 2005.