N.Y. Comp. Codes R. & Regs. tit. 18 § 504.10 : DEPARTMENT OF SOCIAL SERVICES — Regulations of the Department of Social Services — Medical Care — Program Administration — Medical Care-enrollment Of Providers — New enrollments; previously enrolled providers

(a) Any person wishing to participate as a provider on or after the effective date of this Part [January 5, 1987] will be required to submit an application for enrollment in accordance with the requirements of this Part.
(b) All providers enrolled prior to the effective date of this Part [January 5, 1987] shall be required to submit an application for enrollment upon notice from the department. A provider so notified will have 60 days to submit a completed, signed enrollment application to the department. The failure to do so will result in the provider's automatic termination from the medical assistance program. Written notice of the termination will be sent to the provider. Submission of the application within 60 days will continue the provider's enrollment until a determination with respect to the application for enrollment has been made and notice thereof mailed to the provider.
(c) For the convenience of the department and the provider community, providers enrolled prior to the effective date of this Part [January 5, 1987] shall be notified of the requirement to reenroll pursuant to subdivision (b) of this section in accordance with a reenrollment schedule developed by the department. Such schedule may require reenrollment on the basis of provider type, geographic location or a combination of provider type and location.

N.Y. Comp. Codes R. & Regs. Tit. 18 § 504.10