Tex. Ins. Code § 36.155
A person required by subpoena to attend a proceeding before the commissioner or the commissioner's designee is entitled to:
(2) a fee for each day or part of a day the person is required to be present as a witness that is equal to the greater of:
Added by Acts 1999, 76th Leg., ch. 101, Sec. 1, eff. Sept. 1, 1999.