N.Y. Comp. Codes R. & Regs. tit. 14, § 671.4
(1) Eligible facility. In order to receive medical assistance or other OPWDD reimbursement for community residential habilitation services, the provider shall:
(2) Eligible persons are those persons who:
(v) meet the requirements for approval for participation in the home and community-based services waiver as set forth at Subpart 635-10.3(b)(1)-(4) of this Title:
(5) Prior to September 13, 1993, the physician's authorization of services required pursuant to subparagraph (2)(iii) of this subdivision shall have:
(iv) been retained as either an original document or copy in the person's plan of services located with the authorized provider or wherever the person is receiving services.
(b) Standards of certification.
(1) OPWDD shall verify that those who are receiving community residential habilitation services from an authorized provider:
(a) Principles of compliance.