N.Y. CVP Law § 4533-A

Rule 4533-a. Prima facie proof of damages. An itemized bill or\ninvoice, receipted or marked paid, for services or repairs of an amount\nnot in excess of two thousand dollars is admissible in evidence and is\nprima facie evidence of the reasonable value and necessity of such\nservices or repairs itemized therein in any civil action provided it\nbears a certification by the person, firm or corporation, or an\nauthorized agent or employee thereof, rendering such services or making\nsuch repairs and charging for the same, and contains a verified\nstatement that no part of the payment received therefor will be refunded\nto the debtor, and that the amounts itemized therein are the usual and\ncustomary rates charged for such services or repairs by the affiant or\nhis employer; and provided further that a true copy of such itemized\nbill or invoice together with a notice of intention to introduce such\nbill or invoice into evidence pursuant to this rule is served upon each\nparty at least ten days before the trial. No more than one bill or\ninvoice from the same person, firm or corporation to the same debtor\nshall be admissible in evidence under this rule in the same action.\n