R 421.201 "Interested party" defined.

Rule 201. (1) The term "interested party," as used in the act or these rules, means anyone whose statutory rights or obligations might be affected by the outcome or disposition of the determination, redetermination, or decision. A claimant for unemployment benefits is not an interested party to a redetermination of charges or to an appeal relating to a redetermination of charges. An interested party has all of the following rights: (a) The right to receive a copy of the notice of determination or redetermination. (b) The right to request a reconsideration of the determination or redetermination. (c) The right to appeal to a referee or the board of review in the manner provided in the act. (2) The agency is an interested party in any appeal before a referee, the board of review, or in any judicial action involving an order or decision of the board of review or a referee. (3) An employer or employing entity in this or another state is an interested party in connection with a claim for benefits if the employer's or employing entity's account has been charged, the employer or employing entity is presently or potentially chargeable with some portion of benefits paid or payable on such claim, or the employer or employing entity is directly involved in a possible ineligibility or disqualification of a claimant. A base period employer is not an interested party with respect to a nonmonetary adjudication or appeal relating to another base period employer or the last separating employer concerning either benefit payments or charges, unless the issue on appeal is whether the base period employer is chargeable for benefits on the claim under section 29(5) of the act.