Ariz. Rev. Stat. § 23-1091
A. An insurer may decline to issue a workers' compensation or occupational disease policy to an employer. An employer who is refused coverage by two or more insurers shall be placed in the assigned risk plan established by this section unless any of the following factors exist when the employer submits an application for the assigned risk plan:
1. On a current or previous workers' compensation policy, the employer does either of the following:
E. The assigned risk plan administrator shall develop a plan of operation and, on approval by the director of the department of insurance and financial institutions, shall issue a directive for the equitable apportioning of assigned risks among all the insurers. At any time, the director of the department of insurance and financial institutions may require the assigned risk plan administrator to amend the plan of operation. The plan shall include at least the following:
1. A method for the administrator to select one or more insurers transacting workers' compensation insurance in this state to act as servicing carriers. An administrator that is an insurer may act as its own servicing carrier. The administrator shall monitor the performance of the servicing carriers and shall measure performance against the administrator's established standards. A servicing carrier shall: