(1) An aggrieved party may withdraw their appeal or petition for review upon approval by the office of administrative hearings or the commissioner's review office, respectively, at any time prior to the decision. When an appeal or petition for review is withdrawn, the determination, redetermination, order and notice of assessment of premiums or penalties, or other decision that was appealed, is final in accordance with the provisions of Title 50A RCW.

(2) If an appeal is filed and a determination or redetermination of the decision has been made in the aggrieved party's favor, the appeal will be considered withdrawn unless the aggrieved party contests the withdrawal of the appeal in writing within thirty days of the date of redetermination.