D.C. Mun. Regs. tit. 5, r. 5-A8134
If, because of accident, sickness, or other good cause, a respondent fails to receive a notice of a hearing or fails to appear for a hearing, the respondent may, within fifteen (15) days from the date of service of the decision, apply to the Commission to reopen the hearing.
If the Commission finds good cause to reopen a hearing, the Commission shall, as soon as practicable, fix a time and place for a hearing and give the parties notice of the hearing.
The Commission may reopen a hearing for any cause sufficient to the Commission, provided that no appeal is pending before a court or has been decided by a court.
A decision of the Commission on whether to reopen a hearing is within the discretion of the Commission.
D.C. Mun. Regs. tit. 5, r. 5-A8134