N.Y. Comp. Codes R. & Regs. tit. 10, § 732-2.6
(e) The PPO shall develop a handbook, a limited number of which shall be distributed by an appropriate party to all participating employers, upon the entering of a contract between the PPO and the carrier. The handbook shall be written in an understandable manner. Employers will be expected to reproduce the handbook in sufficient numbers to provide copies to employees on an as-needed basis. The handbook shall contain:
(9) a description of the process for opting out of PPO care which shall include:
(f) If a provider ceases participation in the PPO, or if any provider becomes unavailable to provide services to any claimant, the PPO shall provide written notice to affected claimants within 15 days from the date that the organization becomes aware of such change in status. Such notice shall also describe: