New York Consolidated Laws, Civil Practice Law and Rules - CVP Rule 4533-a. Prima facie proof of damages

An itemized bill or invoice, receipted or marked paid, for services or repairs of an amount not in excess of two thousand dollars is admissible in evidence and is prima facie evidence of the reasonable value and necessity of such services or repairs itemized therein in any civil action provided it bears a certification by the person, firm or corporation, or an authorized agent or employee thereof, rendering such services or making such repairs and charging for the same, and contains a verified statement that no part of the payment received therefor will be refunded to the debtor, and that the amounts itemized therein are the usual and customary rates charged for such services or repairs by the affiant or his employer;  and provided further that a true copy of such itemized bill or invoice together with a notice of intention to introduce such bill or invoice into evidence pursuant to this rule is served upon each party at least ten days before the trial.  No more than one bill or invoice from the same person, firm or corporation to the same debtor shall be admissible in evidence under this rule in the same action.