clinical nurse specialist
(5) (A) The term “physician assistant” and the term “nurse practitioner” mean, for purposes of this subchapter, a physician assistant or nurse practitioner who performs such services as such individual is legally authorized to perform (in the State in which the individual performs such services) in accordance with State law (or the State regulatory mechanism provided by State law), and who meets such training, education, and experience requirements (or any combination thereof) as the Secretary may prescribe in regulations. (B) The term “clinical nurse specialist” means, for purposes of this subchapter, an individual who— (i) is a registered nurse and is licensed to practice nursing in the State in which the clinical nurse specialist services are performed; and (ii) holds a master’s degree in a defined clinical area of nursing from an accredited educational institution.