(1) A hospital based residential treatment facility must meet the following requirements:

(a) the residential treatment facility must be in a hospital facility that includes inpatient psychiatric hospital beds and provides inpatient hospital psychiatric care to individuals under 21. The residential treatment facility beds and the hospital beds must be owned and operated by a single entity, and they must be located in an integrated facility;

(b) the residential treatment facility must be located in Montana;

(c) the inpatient psychiatric hospital beds and the residential treatment facility beds must be served by a common administrative and support staff;

(d) the residential treatment facility must be served by no less than one full-time equivalent psychiatrist for every 25 patients;

(e) both the hospital and the residential treatment facility must have an organized medical staff that is on call and available within 20 minutes, 24 hours a day, seven days a week; and

(f) both the hospital and the residential treatment facility must have 24-hour nursing care by licensed registered nurses.