Provides that the policy may provide that any medical, funeral, or household services expense, or any loss of income, that is paid or payable as a personal injury protection coverage benefit or a medical payments coverage benefit under any motor vehicle insurance policy, or as a workers compensation or similar disability policy benefit, is not payable under underinsured motor vehicle coverage. However, a nonduplication policy provision may not reduce the limits of underinsured motor vehicle coverage otherwise available to an injured person.