N.Y. Comp. Codes R. & Regs. tit. 14, § 506.5
(b) A provider of service must indicate to the Office of Mental Health which one of the following billing methodologies will be adopted by the program:
(2) a minimum of two face-to-face contacts within a month between an intensive case manager and an active client shall be considered a billable service, if the intensive case manager's aggregate monthly contacts average four face-to-face contacts per active client.
(c) Collaterals.