6.4 Part C Uninsured/Underinsured Motorists

Part C - Uninsured/Underinsured Motorists

Part C pays damages a covered person is legally entitled to recover from the owner or operator of an uninsured (UM) or underinsured (UIM) motor vehicle because of bodily injury (and, in some states, property damage). It steps into the shoes of the missing liability coverage the at-fault driver should have carried.

The key phrase is 'legally entitled to recover' - the covered person must be able to prove the other driver was at fault and would owe damages. Part C is not no-fault; the insured (or insurer) must establish the uninsured/underinsured motorist's liability.

Four kinds of uninsured motor vehicle

An uninsured motor vehicle under UM coverage includes:

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

Underinsured (UIM) applies when the at-fault driver has liability insurance, but the limits are lower than the insured's UIM limit (or lower than the damages, depending on the state's reduction model).

UIM math: the two state models

UIM offsets confuse candidates because states use different formulas.

Difference / 'excess' states: UIM pays the gap between the insured's UIM limit and the tortfeasor's liability limit. Example: insured carries $100,000 UIM; at-fault driver carries $25,000 BI; insured's proven damages are $90,000. The insured collects $25,000 from the tortfeasor, then UIM pays up to ($100,000 − $25,000) = $75,000, but limited to remaining damages of $65,000 ($90,000 − $25,000). UIM pays $65,000; total recovery $90,000.

Reduction-by-payment states: UIM limit is reduced by amounts already paid. With the same $100,000 UIM and $25,000 paid, UIM pays up to $100,000 − $25,000 = $75,000 of remaining damages. Here remaining damages are $65,000, so UIM still pays $65,000. The models diverge most when damages exceed the UIM limit.

Worked divergence: insured has $50,000 UIM, tortfeasor pays $25,000, proven damages $80,000.

Trap: Many states bar UIM stacking and require the tortfeasor's limit to be lower than the insured's UIM limit to trigger coverage at all. Always read whether the question specifies a difference, reduction, or excess state.

Insureds, hit-and-run proof, and exclusions

The Part C insured definition mirrors Part B's broad track: you and family members while occupying any auto or as pedestrians, plus other persons occupying your covered auto. For hit-and-run UM claims, many states require physical contact with the phantom vehicle and prompt reporting to police (often within 24-72 hours) to deter fraud.

Part C does not apply to: bodily injury while occupying a vehicle owned by but not insured under the policy (the 'owned-but-not-scheduled' / household exclusion); injury settled without the insurer's consent (which destroys subrogation); punitive or exemplary damages in many states; and use as a public/livery conveyance. The owner's vehicle itself is never an 'uninsured motor vehicle' against its own policy.

UM versus UIM - the trigger distinction

The single most tested Part C concept is when each coverage applies:

UM addresses the absence of coverage; UIM addresses insufficient coverage. Many states sell them as a combined UM/UIM limit, but the triggers remain distinct, and a claim cannot be both at once for the same loss.

Consent-to-settle and limit stacking

Two procedural rules trap candidates. First, before accepting any settlement from the at-fault party, a UIM claimant generally must give the UIM insurer notice and the chance to substitute payment (preserving its subrogation rights against the tortfeasor). Settling and signing a release without insurer consent can forfeit the UIM claim entirely.

Second, stacking lets an insured combine UM/UIM limits across multiple vehicles on one policy (or multiple policies) where state law permits. Many policies and states bar stacking through 'limit of liability' anti-stacking language, so the available UM/UIM is the single highest limit, not the sum. Always check whether the question allows stacking before adding limits together.

Uninsured Versus Underinsured Motorist Coverage

Part C splits into two related coverages. Uninsured motorist (UM) applies when the at-fault driver has no liability insurance, is a hit-and-run, or whose insurer is insolvent. Underinsured motorist (UIM) applies when the at-fault driver has insurance but with limits too low to cover the insured's damages. Both pay what the insured would have been legally entitled to recover from the negligent driver for bodily injury, so the insured must establish the other party's fault, unlike the no-fault medical payments coverage.

UM/UIM Limits, Stacking, and the Offset Rule

UIM typically pays the difference between the insured's UIM limit and the at-fault driver's liability limit. For example, with a $100,000 UIM limit and a $25,000 at-fault policy, UIM contributes up to $75,000 toward damages above $25,000. Some states permit stacking of UM/UIM limits across multiple vehicles or policies; others bar it by policy language. The exam tests the offset arithmetic and the rule that UIM never duplicates amounts already collected from the liable driver.

Property Damage and Rejection Requirements

Many states offer uninsured motorist property damage (UMPD) with a deductible to repair the insured's vehicle when an uninsured driver is at fault, an alternative to collision coverage. Because UM/UIM protects consumers, states usually require insurers to offer it at limits at least equal to the liability limits and to obtain the applicant's written rejection or reduction to provide less; absent a valid written rejection, coverage may be read in at the liability limit. This consumer-protection mechanic frequently appears in state-law questions.