38 CFR § 17.273 - Preauthorization.
Preauthorization or advance approval is required for any of the following:
(a) Non-emergent inpatient mental health and substance abuse care including admission of emotionally disturbed children and adolescents to residential treatment centers.
(b) All admissions to a partial hospitalization program (including alcohol rehabilitation).
(c) Outpatient mental health visits in excess of 23 per calendar year and/or more than two (2) sessions per week.
(d) Dental care.
(e) Durable medical equipment with a purchase or total rental price in excess of $2,000.
(f) Organ transplants.