Tex. Ins. Code § 2101.004
(a) A contract or other agreement is void if the contract or agreement is not written into:
(b) A contract or other agreement that is void under Subsection (a) is:
Added by Acts 2005, 79th Leg., Ch. 727 (H.B. 2017), Sec. 2, eff. April 1, 2007.