Tex. Civ. Prac. & Rem. Code § 172.116
(a) Except as agreed by the parties, the arbitration tribunal may:
(2) require a party to:
(b) Except as agreed by the parties, if a party requests or if the arbitration tribunal considers it necessary, the expert shall, after delivery of a written or oral report, participate in an oral hearing at which each party may:
Added by Acts 1997, 75th Leg., ch. 165, Sec. 5.02, eff. Sept. 1, 1997.