An employer not satisfied with the North American Industrial Classification System code assigned to the employer must file an appeal of it within thirty (30) days after mailing of the notice thereof. Said appeal must state the account number and the reason for disagreement with the assigned classification. If the employer files such an appeal, he shall be given a hearing and rights of review in accordance with W.S. 27-3-402 through 408.
053-18 Wyo. Code R. § 18-3