In any event, the limit of underinsured motorist coverage applicable to any claim is determined to be the difference between the amount paid to the claimant under the exhausted liability policy or policies and the limit of underinsured motorist coverage applicable to the motor vehicle involved in the accident. Furthermore, if a claimant is an insured under the underinsured motorist coverage on separate or additional policies, the limit of underinsured motorist coverage applicable to the claimant is the difference between the amount paid to the claimant under the exhausted liability policy or policies and the total limits of the claimant's underinsured motorist coverages as determined by combining the highest limit available under each policy; provided that this sentence shall apply only to insurance on nonfleet private passenger motor vehicles as described in G.S. 58-40-15(9) and (10). The underinsured motorist limits applicable to any one motor vehicle under a policy shall not be combined with or added to the limits applicable to any other motor vehicle under that policy.
An underinsured motorist insurer may at its option, upon a claim pursuant to underinsured motorist coverage, pay moneys without there having first been an exhaustion of the liability insurance policy covering the ownership, use, and maintenance of the underinsured highway vehicle. In the event of payment, the underinsured motorist insurer shall be either:
(a) entitled to receive by assignment from the claimant any right or (b) subrogated to the claimant's right regarding any claim the claimant has or had against the owner, operator, or maintainer of the underinsured highway vehicle, provided that the amount of the insurer's right by subrogation or assignment shall not exceed payments made to the claimant by the insurer. No insurer shall exercise any right of subrogation or any right to approve settlement with the original owner, operator, or maintainer of the underinsured highway vehicle under a policy providing coverage against an underinsured motorist where the insurer has been provided with written notice before a settlement between its insured and the underinsured motorist and the insurer fails to advance a payment to the insured in an amount equal to the tentative settlement within 30 days following receipt of that notice. Further, the insurer shall have the right, at its election, to pursue its claim by assignment or subrogation in the name of the claimant, and the insurer shall not be denominated as a party in its own name except upon its own election. Assignment or subrogation as provided in this subdivision shall not, absent contrary agreement, operate to defeat the claimant's right to pursue recovery against the owner, operator, or maintainer of the underinsured highway vehicle for damages beyond those paid by the underinsured motorist insurer. The claimant and the underinsured motorist insurer may join their claims in a single suit without requiring that the insurer be named as a party. Any claimant who intends to pursue recovery against the owner, operator, or maintainer of the underinsured highway vehicle for moneys beyond those paid by the underinsured motorist insurer shall before doing so give notice to the insurer and give the insurer, at its expense, the opportunity to participate in the prosecution of the claim. Upon the entry of judgment in a suit upon any such claim in which the underinsured motorist insurer and claimant are joined, payment upon the judgment, unless otherwise agreed to, shall be applied pro rata to the claimant's claim beyond payment by the insurer of the owner, operator or maintainer of the underinsured highway vehicle and the claim of the underinsured motorist insurer.
A party injured by the operation of an underinsured highway vehicle who institutes a suit for the recovery of moneys for those injuries and in such an amount that, if recovered, would support a claim under underinsured motorist coverage shall give notice of the initiation of the suit to the underinsured motorist insurer as well as to the insurer providing primary liability coverage upon the underinsured highway vehicle. Upon receipt of notice, the underinsured motorist insurer shall have the right to appear in defense of the claim without being named as a party therein, and without being named as a party may participate in the suit as fully as if it were a party. The underinsured motorist insurer may elect, but may not be compelled, to appear in the action in its own name and present therein a claim against other parties; provided that application is made to and approved by a presiding superior court judge, in any such suit, any insurer providing primary liability insurance on the underinsured highway vehicle may upon payment of all of its applicable limits of liability be released from further liability or obligation to participate in the defense of such proceeding. However, before approving any such application, the court shall be persuaded that the owner, operator, or maintainer of the underinsured highway vehicle against whom a claim has been made has been apprised of the nature of the proceeding and given his right to select counsel of his own choice to appear in the action on his separate behalf. If an underinsured motorist insurer, following the approval of the application, pays in settlement or partial or total satisfaction of judgment moneys to the claimant, the insurer shall be subrogated to or entitled to an assignment of the claimant's rights against the owner, operator, or maintainer of the underinsured highway vehicle and, provided that adequate notice of right of independent representation was given to the owner, operator, or maintainer, a finding of liability or the award of damages shall be res judicata between the underinsured motorist insurer and the owner, operator, or maintainer of underinsured highway vehicle.
As consideration for payment of policy limits by a liability insurer on behalf of the owner, operator, or maintainer of an underinsured motor vehicle, a party injured by an underinsured motor vehicle may execute a contractual covenant not to enforce against the owner, operator, or maintainer of the vehicle any judgment that exceeds the policy limits. A covenant not to enforce judgment shall not preclude the injured party from pursuing available underinsured motorist benefits, unless the terms of the covenant expressly provide otherwise, and shall not preclude an insurer providing underinsured motorist coverage from pursuing any right of subrogation.
Notwithstanding the provisions of this subsection, no policy of motor vehicle liability insurance applicable solely to commercial motor vehicles as defined in G.S. 20-4.01(3d) or applicable solely to fleet vehicles shall be required to provide underinsured motorist coverage. When determining whether a policy is applicable solely to fleet vehicles, the insurer may rely upon the number of vehicles reported by the insured at the time of the issuance of the policy for the policy term in question. In the event of a renewal of the policy, when determining whether a policy is applicable solely to fleet vehicles, the insurer may rely upon the number of vehicles reported by the insured at the time of the renewal of the policy for the policy term in question. Any motor vehicle liability policy that insures both commercial motor vehicles as defined in G.S. 20-4.01(3d) and noncommercial motor vehicles shall provide underinsured motorist coverage in accordance with the provisions of this subsection in an amount equal to the highest limits of bodily injury liability coverage for any one noncommercial motor vehicle insured under the policy, subject to the right of the insured to purchase greater or lesser underinsured motorist bodily injury liability coverage limits as set forth in this subsection. For the purpose of the immediately preceding sentence, noncommercial motor vehicle shall mean any motor vehicle that is not a commercial motor vehicle as defined in G.S. 20-4.01(3d), but that is otherwise subject to the requirements of this subsection.