Tex. Ins. Code § 1451.126
(a) A health insurer or licensed third-party administrator may not deny reimbursement to a health care practitioner for the provision of covered services of physical modalities and procedures that are within the scope of the practitioner's practice if the services are performed in strict compliance with:
(b) A health maintenance organization or preferred provider benefit plan issuer may not deny reimbursement to a participating health care practitioner for services provided under a coverage agreement solely because of the type of practitioner providing the services if the services are performed in strict compliance with:
Added by Acts 2003, 78th Leg., ch. 1274, Sec. 3, eff. April 1, 2005.