Any party may file an application for rehearing with the presiding officer stating the specific grounds therefor, and the relief sought, within 20 days after the issuance of any final decision by the board. A copy of the application shall be timely mailed by the department to all parties of record not joining therein. Such application for rehearing shall be deemed to have been denied unless the board or the presiding officer grants the application within 20 days of the filing. A rehearing shall not be granted unless it is necessary to correct a mistake of law or fact, or for other good cause.
Iowa Admin. Code r. 281-6.20