N.Y. Comp. Codes R. & Regs. tit. 18 § 519.5 : DEPARTMENT OF SOCIAL SERVICES — Regulations of the Department of Social Services — Medical Care — Policies and Standards Governing Provision of Medical and Dental Care — Provider Hearings — Notice

(a) The department must issue a written notice of a final determination to the person if it intends to sanction him/her, or require repayment of an overpayment or restitution.
(b) The notice must be mailed to the person's designated payment or correspondence address or last known address.
(c) The notice must clearly state the determination made, the basis and specific reasons for the determination, the effect of any action to be taken, the amount of any overpayment or penalty, and the effective date of the action. The notice must also include information concerning the right to a hearing.

N.Y. Comp. Codes R. & Regs. Tit. 18 § 519.5