CPLR 3101 (a) calls for “full disclosure of all matter material and necessary in the prosecution or defense of an action, regardless of the burden of proof.” Evidence is “material” if sought “in good faith for possible use as evidence-in-chief or in rebuttal or for cross-examination” (Allen v Crowell-Collier Publ. Co., 21 NY2d 403, 407 [1968] [quoting other authority]). Furthermore, waiver of a physician-patient privilege occurs when a party voluntarily and affirmatively inserts the issue of a physical or mental defect or condition into the litigation by way of testimony or written submission (see Avila v 106 Corona Realty Corp., 300 AD2d 266 [2002]).
