N.Y. Comp. Codes R. & Regs. tit. 11, § 101.8
(a) Notice to the superintendent of the termination, cancellation, or nonrenewal of the provider stop loss insurance policy and, notice of any material change to the terms of the coverage, shall be in writing and shall be mailed or delivered to the superintendent at the following address:
New York State Department of Financial Services Health Bureau One State Street New York, NY 10004