34 Tex. Admin. Code § 121.21
A decision is final in the absence of a timely motion for rehearing, and is final and appealable on the date of rendition of an order overruling the motion for rehearing, or on the date the motion is overruled by operation of law.
Source Note:The provisions of this §121.21 adopted to be effective July 23, 1976, 1 TexReg 1894.