Idaho Code § 6-1012
In any case, claim or action for damages due to injury to or death of any person, brought against any physician and surgeon or other provider of health care, including, without limitation, any dentist, physicians' assistant, nurse practitioner, registered nurse, licensed practical nurse, nurse anesthetist, medical technologist, physical therapist, hospital or nursing home, or any person vicariously liable for the negligence of them or any of them, on account of the provision of or failure to provide health care or on account of any matter incidental or related thereto, such claimant or plaintiff must, as an essential part of his or her case in chief, affirmatively prove by direct expert testimony and by a preponderance of all the competent evidence, that such defendant then and there negligently failed to meet the applicable standard of health care practice of the community in which such care allegedly was or should have been provided, as such standard existed at the time and place of the alleged negligence of such physician and surgeon, hospital or other such health care provider and as such standard then and there existed with respect to the class of health care provider that such defendant then and there belonged to and in which capacity he, she or it was functioning. Such individual providers of health care shall be judged in such cases in comparison with similarly trained and qualified providers of the same class in the same community, taking into account his or her training, experience, and fields of medical specialization, if any. If there be no other like provider in the community and the standard of practice is therefore indeterminable, evidence of such standard in similar Idaho communities at said time may be considered. As used in this act, the term "community" refers to that geographical area ordinarily served by the licensed general hospital at or nearest to which such care was or allegedly should have been provided.
Idaho Code § 6-1012