40 Tex. Admin. Code §§ 819.191–819.201 § 819.196

If a party to whom a notice of hearing is served or provided under this section fails to appear for hearing, the hearing officer may proceed in that party's absence on a default basis. If a proposal for decision or final decision is issued, the factual allegations listed in the notice of hearing may be deemed admitted. If a party fails to appear at a hearing, the hearing officer will issue a notice of default to that party. A party may file a motion no later than 15 calendar days after the notice of default is mailed to set aside a default announced at the hearing and to reopen the record. If a timely motion to set aside a default is filed, the hearing officer may grant the motion, set aside the default, and reopen the hearing for good cause shown, or in the interests of justice.