N.D. Cent. Code § 32-39-02: Voluntary service or payment not admission of liability

No receipt of a voluntary service or partial payment of a claim, including a claim of medical malpractice, against any person based on alleged liability of that person for injury or damage arising out of any occurrence may be construed as a waiver or release of the claim by the person receiving the service or payment, unless a written waiver or release is given. No receipt, provision, or payment of a voluntary service or partial payment of a claim may reduce the amount of damages which may be pleaded and proved in a court proceeding between the parties.