N.Y. Comp. Codes R. & Regs. tit. 8, § 64.8
(a) Requirements for certification. An applicant for certification as a clinical nurse specialist shall:
(b) Professional education and experience criteria. To meet the professional education and experience requirements for certification as a clinical nurse specialist in this State, the applicant shall present evidence of having met the criteria in one of the four paragraphs of this subdivision:
(4) submitting an application and the required fee for certification as a clinical nurse specialist to the department prior to September 15, 2015 and satisfactorily meeting, as determined by the department, the criteria set forth in subparagraph (i) or (ii) of this paragraph prior to September 15, 2017:
(ii) current certification as a clinical nurse specialist by a national certifying body acceptable to the department.
(c) Certificates.