875—84.2 (17A,89) Appeal to the board. The commissioner’s ruling on a petition for reconsideration or the commissioner’s deemed denial of a petition for reconsideration may be appealed to the board. An appeal must be filed in writing with the board within 30 calendar days of the earlier of either the issuance of the commissioner’s written ruling on a petition for reconsideration or the commissioner’s deemed denial of a petition for reconsideration. At a minimum, an appeal shall include a short and concise statement of the basis for the appeal. Consideration of an appeal of a ruling on a petition for reconsideration shall be a contested case proceeding subject to the provisions of Iowa Code chapter 17A. The commissioner shall have an automatic right of intervention in any appeal of the ruling on petition for reconsideration and shall defend the ruling in a contested case proceeding.