6.4 Part C Uninsured/Underinsured Motorists

Part C: Uninsured / Underinsured Motorists

Part C is first-party coverage that pays the insured for damages they are legally entitled to recover from the owner or operator of an uninsured (UM) or underinsured (UIM) motor vehicle. It steps into the shoes of the at-fault driver who cannot pay. In most states UM/UIM must be offered and may only be rejected in writing; if the application has no written rejection, UM/UIM is generally deemed included at the liability limits.

Uninsured vs. Underinsured

• Uninsured motorist (UM): the at-fault vehicle has no liability insurance, the insurer is insolvent, or the driver is a hit-and-run (phantom vehicle) that cannot be identified. UM primarily covers bodily injury; some states add UMPD (property damage).
• Underinsured motorist (UIM): the at-fault driver has liability insurance, but the limits are lower than the injured insured's damages. UIM fills the gap between the at-fault driver's limit and the insured's UIM limit.

Worked UIM Example

An insured carries $100,000 of UIM and suffers $150,000 of legally recoverable BI. The at-fault driver carries only $50,000 of liability.

Under the common "difference / excess" approach:

• At-fault driver's liability pays $50,000.
• UIM pays the difference up to the insured's UIM limit: $100,000 limit − $50,000 already collected = $50,000.
• Insured recovers $100,000 total; the remaining $50,000 of damages is uncompensated because total damages exceed the UIM limit.

Note: under a minority "reduced by" statute, the math can differ — always apply the state's offset rule. Exam questions will signal which approach to use.

Stacking

Stacking means combining UM/UIM limits across multiple vehicles or policies:

Whether stacking is allowed depends on state law and anti-stacking policy language. Many states permit stacking unless validly excluded; others prohibit it. If a question gives multiple vehicles and a premium charged per car, consider whether the state allows stacking before choosing the answer.

Part C Conditions and Traps

• Hit-and-run / phantom vehicle: UM responds, but the insured usually must report promptly to police and the insurer; corroboration may be required because there is no contact in a true phantom claim.
• Arbitration: if the insurer and insured disagree on whether the insured is legally entitled to recover or on the amount, the PAP typically provides for arbitration.
• No double recovery: amounts paid under UM/UIM are reduced by sums paid by or for the at-fault party and may be coordinated with Part B.
• Exclusion trap: Part C generally does not apply to bodily injury sustained while occupying a vehicle owned by the insured but not insured for UM/UIM under the policy — the same owned-but-not-insured logic as Part B.

Uninsured vs. Underinsured Motorists Defined

Part C protects covered persons injured by a negligent driver who either has no liability insurance (uninsured motorist, UM) or has insurance with limits too low to cover the damages (underinsured motorist, UIM). UM also typically responds to hit-and-run accidents where the at-fault driver cannot be identified. Coverage requires that the other driver be legally liable; UM/UIM is not no-fault first-party coverage like PIP, so the insured must establish the other party's fault and the resulting damages.

Worked UIM Example

Suppose an insured suffers 100,000 dollars in damages, the at-fault driver carries only 25,000 dollars of bodily injury liability, and the insured carries 100,000 dollars of UIM. Under the common difference (offset) approach, UIM pays the gap between the insured's UIM limit and the at-fault driver's available limit: 100,000 minus 25,000 equals 75,000 dollars from UIM, plus the 25,000 from the at-fault driver, totaling 100,000. Some states instead add UIM on top of the tortfeasor's limit. The exam tests whether you apply the offset correctly, so read whether the jurisdiction uses a reduce-by or add-on approach.

Stacking of UM/UIM Limits

Stacking lets an insured combine UM/UIM limits across multiple vehicles or policies to increase available coverage. Intra-policy stacking combines limits for several autos on one policy; inter-policy stacking combines limits across separate policies. Many insurers use anti-stacking language to limit recovery to the highest single applicable limit, and state law governs whether such language is enforceable. A scenario describing an insured with three cars each carrying 50,000 dollars of UM is testing whether stacking yields 150,000 or only 50,000, which depends on the policy language and state rules.

Part C Conditions and Common Traps

Part C imposes notice and cooperation duties, often requires prompt reporting of a hit-and-run to police, and may condition coverage on the insured not settling with the at-fault party in a way that destroys the insurer's subrogation rights, so an insured who signs a release with the tortfeasor's insurer without consent can forfeit UIM. The covered-person definition mirrors Part A/B (named insured and family in any auto or as pedestrians, others in the covered auto). The owned-but-not-insured exclusion again bars recovery while occupying an owned vehicle not insured for UM.

These conditions and the consent-to-settle requirement are recurring exam pitfalls.