(a) Allowable costs shall mean those costs incurred by a residential treatment facility for children and youth. To be allowable, costs must be reasonable and must relate to patient care.

(b) Allowable days shall mean the total of patient days and reserve bed days provided by a residential treatment facility for children and youth subject to a minimum and maximum utilization standard pursuant to section 578.13 of this Part.

(c) Commissioner shall mean the Commissioner of Mental Health.

(d) Fiscal year of a residential treatment facility for children and youth shall mean the 12-month period beginning on July 1st and ending on June 30th.

(e) Medicare program shall mean the Federal program of health insurance for the aged and disabled established by title XVIII of the Social Security Act.

(f) Patient day shall mean the unit of measure denoting lodging provided and services rendered to one resident between the census-taking hour on two successive days. A patient day is counted on the day of admission, but not on the day of discharge. A patient day is counted when a resident is admitted with the expectation of remaining overnight but is discharged on the same day. A patient day is counted on the day a resident returns from temporary hospitalization or leave of absence for a therapy day, but not on the day a resident departs.

(g) Provider of services means the organization which is legally responsible for the operation of a program. The organization may be an individual, partnership, association, corporation, public agency or a psychiatric center or institute operated by the Office of Mental Health.

(h) Reserved bed day shall mean the unit of measure between the census-taking hour on two successive days during which a bed is reserved for a resident who is temporarily hospitalized or is on leave of absence for a therapy day pursuant to Part 576 of this Title. A reserved bed day is counted on the day a resident departs for a temporary hospitalization or leave of absence for a therapy day, but not on the day a resident returns. In no event may a reserved bed day be counted on a day for which a patient day is counted. A reserved bed day is counted on the day telephone notification is received of circumstances requiring termination of the bed reservation but not on any subsequent days.

(i) Residential treatment facility is an inpatient psychiatric facility which provides active treatment under the direction of a physician for children who are under 21 years of age and is issued an operating certificate pursuant to Part 584 of this Title.