N.Y. New York City Civil Court Law § 1804-a

§ 1804-A. Informal and simplified procedure on commercial claims. The\ncourt shall conduct hearings upon commercial claims in such manner as to\ndo substantial justice between the parties according to the rules of\nsubstantive law and shall not be bound by statutory provisions or rules\nof practice, procedure, pleading or evidence, except statutory\nprovisions relating to privileged communications and personal\ntransactions or communications with a decedent or person with a mental\nillness. An itemized bill or invoice, receipted or marked paid, or two\nitemized estimates for services or repairs, are admissible in evidence\nand are prima facie evidence of the reasonable value and necessity of\nsuch services and repairs. Disclosure shall be unavailable in commercial\nclaims procedure except upon order of the court on showing of proper\ncircumstances. The provisions of this act and the rules of this court,\ntogether with the statutes and rules governing supreme court practice,\nshall apply to claims brought under this article so far as the same can\nbe made applicable and are not in conflict with the provisions of this\narticle; in case of conflict, the provisions of this article shall\ncontrol.\n