Ariz. Rev. Stat. § 25-320
D. The supreme court shall establish guidelines for determining the amount of child support. The amount resulting from the application of these guidelines is the amount of child support ordered unless a written finding is made, based on criteria approved by the supreme court, that application of the guidelines would be inappropriate or unjust in a particular case. The supreme court shall review the guidelines at least once every four years to ensure that their application results in the determination of appropriate child support amounts. The supreme court shall base the guidelines and criteria for deviation from them on all relevant factors, considered together and weighed in conjunction with each other, including:
E. Even if a child is over the age of majority when a petition is filed or at the time of the final decree, the court may order support to continue past the age of majority if all of the following are true:
K. If the court finds that neither parent has the ability to obtain medical insurance for the child that is accessible and available at a reasonable cost, the court shall:
R. For the purposes of this section: