Tex. Ins. Code § 1301.064
Subject to Subchapter C, a preferred provider contract must provide for payment to a physician or health care provider for health care services and benefits provided to an insured under the contract and to which the insured is entitled under the terms of the contract not later than:
Added by Acts 2003, 78th Leg., ch. 1274, Sec. 3, eff. April 1, 2005.