N.D. Cent. Code § 26.1-41-14
When an injured person is provided basic no-fault benefits by an insurance policy issued in compliance with this chapter, the injured person is covered only to the extent of the basic no-fault benefits provided on the secured motor vehicle involved in the accident and the optional excess no-fault benefits purchased by the injured person, or a relative of the injured person, on a secured motor vehicle, if any, in excess of the basic no-fault benefits provided on the secured motor vehicle involved in the accident. If any person is injured while occupying an unsecured motor vehicle, basic no-fault benefits are only available to the extent of the applicable basic no-fault benefits provided to the injured person as the owner of a secured motor vehicle or as a relative of the owner of a secured motor vehicle. In either instance, basic no-fault benefits on any secured motor vehicle may not be added or stacked upon basic no-fault benefits available from any other source.
N.D.C.C. § 26.1-41-14