6.4 Part C Uninsured/Underinsured Motorists

Part C: Uninsured/Underinsured Motorists

Part C protects insureds when the at-fault driver is uninsured or underinsured. It pays compensatory damages an insured is legally entitled to recover from the owner/operator of an uninsured (UM) or underinsured (UIM) motor vehicle because of bodily injury (and, where the state requires it, property damage). The key distinction from Parts A and B: Part C requires the other party to be at fault — it stands in the shoes of the negligent uninsured driver.

UM vs. UIM — The Core Definitions

A hit-and-run (phantom vehicle) is treated as uninsured. Many states require physical contact or independent corroboration for hit-and-run UM claims. UM/UIM is mandatory or must be offered in most states; insureds may reject UIM in writing where allowed.

Worked Example — Underinsured Motorist Math

An insured carries UIM limits of $100,000 per person. The insured suffers $130,000 in damages. The at-fault driver carries only $50,000 of liability coverage.

Under a common "limits-minus-limits" (offset) approach, UIM pays the insured's UIM limit minus the at-fault driver's liability limit: $100,000 − $50,000 = $50,000. Combined recovery = $50,000 (other driver) + $50,000 (UIM) = $100,000.

Under a "damages-minus-limits" (excess) approach used in some states, UIM pays damages minus the tortfeasor's payment, capped at the UIM limit: $130,000 − $50,000 = $80,000, but capped at the $100,000 UIM limit, so $80,000. Know that the offset method is the more common exam answer unless the state is specified.

Part C Triggers, Exclusions, and Traps

• Part C does not apply to a vehicle owned by or available for the regular use of the named insured or a family member that is not insured under this policy (the "family-owned vehicle" / owned-but-not-insured exclusion).
• Coverage does not apply if the insured settles with the at-fault party without the insurer's consent, which can impair the insurer's subrogation rights.
• A vehicle owned/operated by a self-insurer or a government unit may not count as uninsured in some states.
• UM/UIM limits are usually not stackable unless the state permits inter-policy or intra-policy stacking.

Trap: Part C pays only what the insured is legally entitled to recover — if the other driver was not at fault, Part C pays nothing, even though Part B (no-fault) would still respond to the same injuries.

UMPD and the Hit-and-Run Problem

Some states add Uninsured Motorists Property Damage (UMPD) to repair the insured's vehicle when an uninsured driver is at fault and the insured carries no collision coverage; other states fold that exposure into collision instead. The exam tests the hit-and-run rule closely: a phantom or hit-and-run vehicle counts as uninsured, but many states require either physical contact with the unidentified vehicle or independent corroboration of the phantom vehicle's existence before a UM bodily-injury claim will pay. This requirement guards against fabricated single-car-accident claims dressed up as phantom-vehicle losses.

Arbitration and the Consent-to-Settle Trap

Part C contains an arbitration provision: if the insured and insurer disagree on whether the insured is legally entitled to recover or on the amount, either party may demand arbitration (or, in some forms, litigation).

Separately, the consent-to-settle condition is a frequent exam trap - if the insured settles with the at-fault party (and that party's insurer) without the UM/UIM insurer's written consent, coverage can be voided because the settlement destroys the insurer's subrogation right against the tortfeasor. The correct practice is to notify the UM/UIM carrier and obtain consent before accepting any settlement that would release the at-fault driver.

Stacking and Limit Selection

Whether UM/UIM limits can be stacked - combined across multiple vehicles on one policy (intra-policy) or across multiple policies (inter-policy) - depends entirely on state law and policy wording; many policies contain anti-stacking language that the exam expects you to recognize.

UM/UIM limits are usually offered up to the insured's liability limit and may be rejected only in writing where the state permits. Tie this back to the worked example: under the common offset (limits-minus-limits) method, raising the insured's UIM limit increases the gap UIM can fill above the tortfeasor's limits, which is the practical reason to buy UM/UIM equal to one's liability coverage.

UM and UIM as Separate Triggers

Keep the two triggers distinct. UM applies when the at-fault driver has no liability insurance, is a qualifying hit-and-run, or is insured by a company that becomes insolvent after the accident. UIM applies only when the at-fault driver has insurance but in an amount insufficient to cover the insured's damages.

A claim cannot be both at once: you first exhaust the tortfeasor's liability limits, and only if damages remain does the UIM analysis begin. Many states condition UIM on the insured's UIM limit exceeding the tortfeasor's liability limit (the "limit-trigger" rule), so a driver with the state-minimum UIM limit may have no UIM claim against a minimally insured tortfeasor even with serious injuries - a counterintuitive result the exam likes to test.

Why Consent and Subrogation Are Linked

The consent-to-settle rule exists to protect the insurer's right to subrogate against the at-fault driver. If the insured signs a general release in exchange for the tortfeasor's policy limits without notifying the UM/UIM carrier, the carrier loses its ability to recoup from that driver, so the policy lets it deny the UM/UIM claim. The correct sequence is to obtain the carrier's written consent (or let it advance the settlement amount to preserve subrogation) before releasing the at-fault party. This procedural trap, the at-fault requirement, and the owned-but-not-insured exclusion are the three Part C facts most often missed.