Ariz. Rev. Stat. § 20-382
A. This article applies to all insurance on risks or on operations in this state, except:
8. Rates developed by an insurer to be applied individually to the insurance policies of risks, other than medical malpractice risks and industrial insured risks pursuant to section 20-400.10, for which no rate service organization has published a rate or loss costs in this or any other state and for which insufficient similar exposure units and loss experience data exist to develop statistically credible rates for the risk and no homogeneous rating class exists in which the risk could reasonably be placed. With respect to each type of risk covered by this subsection, the insurer shall annually certify by January 30 to the director for the preceding calendar year, on a form acceptable to the director, that the insurer did not have when the risks were written credible experience to establish a rating class for the specific types of risks. The insurer or rate service organization on the insurer's behalf shall file a rate for the specific risks with the director pursuant to section 20-385 when either of the following occurs: