N.Y. Comp. Codes R. & Regs. tit. 11, § 362-4.3
(b) Income shall include, but shall not be limited to, the following:
(d) Health maintenance organizations and participating insurers shall collect such documentation as is necessary and sufficient to initially verify that the household income requirements of the Healthy New York Program have been satisfied. Such documentation may include, but not be limited to one or more of the following: