6.4 Part C Uninsured/Underinsured Motorists

6.4 Part C: Uninsured and Underinsured Motorists Coverage

Part C — Uninsured Motorists Coverage (UM) pays the covered person for bodily injury (and in some states property damage) that the insured is legally entitled to recover from the owner or operator of an uninsured motor vehicle. Many states add Underinsured Motorists Coverage (UIM) for at-fault drivers who carry insurance below the damages owed. UM/UIM is first-party coverage that steps into the shoes of the negligent uninsured driver — the insured must still prove fault and damages.

What counts as an uninsured motor vehicle

An uninsured motor vehicle includes:

1. A vehicle with no bodily injury liability policy in effect at the time of the accident.
2. A vehicle whose liability limits are less than the state-required minimum.
3. A hit-and-run vehicle whose owner/operator cannot be identified that strikes the insured or the covered auto.
4. A vehicle whose insurer denies coverage or becomes insolvent.

What is NOT an uninsured motor vehicle

The definition specifically excludes: any vehicle owned by or furnished for the regular use of the named insured or family member; any vehicle owned/operated by a self-insurer (unless that self-insurer becomes insolvent); any vehicle owned by a government unit; and equipment designed mainly for off-road use. These exclusions prevent the insured from collecting UM from their own household fleet.

UM versus UIM — the offset math

UM applies when the other driver has no insurance. UIM applies when the other driver has insurance but not enough. Most states use a limits-offset approach. Assume the insured carries UIM of 100/300 and is injured by an at-fault driver carrying only 25/50 liability. The insured's actual damages are $80,000.

Because the $80,000 in damages is fully covered, the insured collects $25,000 from the at-fault driver and $55,000 from UIM (UIM tops up to the $80,000 actual loss, never beyond it). The offset cap of $75,000 simply means UIM could pay up to that amount if damages were higher.

Exam trap (excess vs. offset states): In offset states, the at-fault driver's limit is subtracted from the insured's UIM limit. In excess (add-on) states, UIM stacks on top of the at-fault driver's limit. The same fact pattern produces different answers depending on state law — read the question for which method applies.

UM-BI versus UM-PD

UM is usually split into Uninsured Motorists Bodily Injury (UMBI) and, where offered, Uninsured Motorists Property Damage (UMPD). UMBI pays for the covered person's injuries; UMPD pays for damage to the covered auto caused by an identified uninsured driver, often with a deductible (commonly $200-$250) and frequently NOT available for hit-and-run unless there is physical contact. Many insureds rely on collision coverage rather than UMPD for vehicle damage, since collision pays regardless of the other driver's identity. Knowing which coverage responds to a phantom (no-contact) vehicle is a classic exam discriminator.

Stacking and selection rules

Many states permit stacking — combining UM limits across multiple insured vehicles or policies. Inter-policy stacking combines limits from separate policies; intra-policy stacking multiplies the limit by the number of autos on one policy. States increasingly let insurers include anti-stacking language. Insurers must generally offer UM/UIM equal to the liability limit, and the insured must reject higher limits in writing to take lower ones — a frequently tested consumer-protection rule.

Arbitration and the consent-to-settle trap

If the insured and insurer disagree on whether the insured is legally entitled to recover or on the amount, UM disputes are commonly resolved by arbitration. Critically, the insured must usually obtain the insurer's written consent before settling with the at-fault party; settling and releasing the tortfeasor without consent can destroy the insurer's subrogation rights and void UM/UIM coverage.

Limits, trigger summary, and the "phantom vehicle" rule

UM/UIM limits are written like liability — split (e.g., 100/300) or as a combined single limit — and apply per person/per accident the same way Part A does. The coverage triggers only after the insured establishes the other driver's fault and damages; if the insured is found at fault, UM pays nothing. For a hit-and-run or phantom vehicle, most states require either physical contact or independent corroborating evidence before UM responds, to deter fraudulent "a car ran me off the road" claims with no contact.

How UM/UIM, med pay, and PIP fit together

A seriously injured insured may tap several first-party coverages in sequence: PIP or med pay pays immediate medical bills, while UM/UIM addresses the broader bodily-injury damages (lost wages, pain and suffering) the uninsured driver legally owes. The coverages are coordinated so the insured is made whole once, not multiple times — insurers offset and subrogate to prevent duplication. Expect questions that ask which coverage responds when the at-fault driver has no insurance versus too little, and which one pays general damages versus medical bills only.