New York State Civil Practice Law and Rules §214-a.

Action for medical, dental or podiatric malpractice to be commenced within two years and six months; exceptions. An action for medical, dental or podiatric malpractice must be commenced within two years and six months of the act, omission or failure complained of or last treatment where there is continuous treatment for the same illness, injury or condition which gave rise to the said act, omission or failure; provided, however, that where the action is based upon the discovery of a foreign object in the body of the patient, the action may be commenced within one year of the date of such discovery or of the date of discovery of facts which would reasonably lead to such discovery, whichever is earlier. For the purpose of this section the term "continuous treatment" shall not include examinations undertaken at the request of the patient for the sole purpose of ascertaining the state of the patient`s condition. For the purpose of this section the term "foreign object" shall not include a chemical compound, fixation device or prosthetic aid or device.