Ariz. Rev. Stat. § 20-2534
E. If the member chooses to proceed with an expedited appeal, the member's treating provider shall immediately submit a written appeal of the denial of the service to the utilization review agent and provide the utilization review agent with any additional material justification or documentation to support the member's request for the service. Within three business days after receiving the request for an expedited appeal, the utilization review agent shall provide notice of the expedited appeal determination as prescribed in this subsection. If the member's complaint involves an issue of medical necessity or appropriateness, including health care setting, level of care or effectiveness of a covered benefit, or is experimental or investigational under the coverage document and not whether the service is covered, the utilization review agent shall select a provider who shall review the appeal and render the determination based on the utilization review plan adopted by the utilization review agent. If the utilization review agent or provider denies the expedited appeal, the utilization review agent shall telephonically provide and send to the member and the member's treating provider a notice of the denial and of the member's option to immediately proceed to the external independent review prescribed in section 20-2537. For the purposes of this subsection:
1. "Advanced practice registered nurse" means any of the following as defined in section 32-1601:
2. "Provider" means either of the following: