Iowa Code § 222.83

The estates of all nonresident patients who are provided treatment, training, instruction, care, habilitation, and support in or by a resource center, and all persons legally bound for the support of such persons, shall be liable to the state for the reasonable value of such services. The certificate of the superintendent of the resource center in which any nonresident is or has been a patient, showing the amounts drawn from the state treasury or due therefrom as provided by law on account of such nonresident patient, shall be presumptive evidence of the reasonable value of such services furnished such patient by the resource center.