An existing or prospective provider of substance use disorder services is required to obtain the prior approval of the commissioner (commissioner) of the New York State Office of Alcoholism and Substance Abuse Services (office or OASAS) before establishing, incorporating and/or constructing a facility or offering a service. This Part prescribes the criteria and procedures applicable for obtaining such prior approval, as well as the procedural requirements for obtaining the required authorization to provide one or more services by either a prospective or existing provider.