Ariz. Rev. Stat. § 20-3115
C. Within fifteen days after receipt of a request for arbitration, the department shall do one of the following:
3. If the department cannot determine whether the surprise out-of-network bill qualifies for arbitration, request in writing any additional information from the enrollee, health insurer or health care provider or its billing company that is needed to determine whether the surprise out-of-network bill qualifies for arbitration and all of the following apply:
H. Before the arbitration:
K. The arbitrator shall determine the amount the health care provider is entitled to receive as payment for the health care services. The arbitrator shall allow each party to provide information the arbitrator reasonably determines to be relevant in evaluating the surprise out-of-network bill, including the following information: