In addition to the definitions in A.R.S. § 36-401 and R9-10-101, the following applies in this Article unless otherwise specified:
"Child and adolescent residential treatment services" means behavioral health services and physical health services provided in or by a behavioral health inpatient facility to a patient who is:
Under 18 years of age, or
Under 21 years of age and meets the criteria in R9-10-318(B).
Ariz. Admin. Code § R9-10-301