N.D. Cent. Code § 65-05-01.2

When an employee is involved in an accident while on the job, the employee shall take steps immediately to notify the employer that the accident occurred and what is the general nature of the injury to the employee, if apparent. Notice may be either oral or written. The notice must be given to the employee's immediate supervisor or another supervisor authorized to receive notice. Absent good cause, notice may not be given later than seven days after the accident occurred or the general nature of the employee's injury became apparent.