N.Y. Comp. Codes R. & Regs. tit. 14, § 822.10
(c) Programs must be certified by the office to provide outpatient rehabilitation services.
(d) Staffing.
There must be at least one full-time equivalent counselor or therapist for every 20 patients receiving outpatient rehabilitation services. If volunteers or student interns are used, they may not be counted in the counselor-to-patient ratio. In addition to the staffing required in section 822.7 of this Part, the following additional staff members are required:
(e) If a program is providing outpatient rehabilitation services, the following services must be available either directly or through written agreements: