N.D. Cent. Code § 28-01-46
Any action for injury or death alleging professional negligence by a physician, nurse, hospital, or nursing, basic, or assisted living facility licensed by this state or by any other health care organization, including an ambulatory surgery center or group of physicians operating a clinic or outpatient care facility, must be dismissed without prejudice on motion unless the plaintiff serves upon the defendant an affidavit containing an admissible expert opinion to support a prima facie case of professional negligence within three months of the commencement of the action. The court may set a later date for serving the affidavit for good cause shown by the plaintiff if the plaintiff's request for an extension of time is made before the expiration of the three-month period following commencement of the action. The expert's affidavit must identify the name and business address of the expert, indicate the expert's field of expertise, and contain a brief summary of the basis for the expert's opinion. This section does not apply to unintentional failure to remove a foreign substance from within the body of a patient, or performance of a medical procedure upon the wrong patient, organ, limb, or other part of the patient's body, or other obvious occurrence.
N.D.C.C. § 28-01-46