N.Y. Workers' Comp. Law § 22
Upon its own motion or upon the application of any party in interest, on the ground of a change in conditions or proof of erroneous wage rate, the board may at any time, subject to the limitations set forth in sections twenty-five-a and one hundred and twenty-three of this chapter, review any award, decision or order and, on such review, may make an award ending, diminishing or increasing the compensation previously awarded, subject to the maximum or minimum provided in this chapter, and shall immediately send to the parties a copy of its decision, which shall include a statement of the facts which formed the basis of its action. No such review shall affect such award as regards any moneys already paid, except that an award increasing the compensation rate may be made effective from date of injury, and except that if any part of the compensation due or to become due is unpaid, an award decreasing the compensation rate may be made effective from the date of injury, and any payments made prior thereto in excess of such decreased rate shall be deducted from any unpaid compensation, in such manner and by such methods as may be determined by the board.
N.Y. Work. Comp. Law § 22