N.D. Cent. Code § 65-07.1-03

Any employer or workstation, as defined in this chapter, shall not be liable to respond in damages at common law or by statute for injuries to or the death of any employee, as defined in this chapter, whenever the employer has complied with the provisions of this chapter and during the period for which premiums, as set by the organization, have been paid. Any employee who elects, before injury or death, not to come under the provisions of this chapter may do so by notifying the organization, employer, and workstation of such election in writing.