6.4 Part C Uninsured/Underinsured Motorists

The Uninsured Motorists Insuring Agreement

Part C answers a practical problem: an at-fault driver who cannot pay. The insurer agrees to pay compensatory damages an insured is legally entitled to recover from the owner or operator of an uninsured motor vehicle because of bodily injury sustained by the insured in an auto accident. Part C is added by endorsement (such as PP 04 03) and is mandatory or must be offered in most states.

Part C is a hybrid: it is first-party (the insured collects from their own insurer) but fault-based (the insured must prove the other driver was legally liable). If the insured was entirely at fault, Part C pays nothing, because the insured would not be "legally entitled to recover" from the other driver.

What Counts as an "Uninsured Motor Vehicle"

An uninsured motor vehicle is one:

1. To which no bodily injury liability policy applies at the time of the accident.
2. Whose insurer denies coverage or becomes insolvent.
3. That is a hit-and-run vehicle whose operator or owner cannot be identified (a "phantom" vehicle).

State variation: many states require physical contact with the phantom vehicle, or independent corroboration of the phantom's existence, before paying a hit-and-run UM claim, a guard against staged single-car losses.

An uninsured vehicle does not include a vehicle owned by or furnished for the regular use of the named insured or a family member, a vehicle owned by a government body that is self-insured, or the insured's own covered auto.

Underinsured Motorists (UIM)

UIM coverage responds when the at-fault driver has liability insurance, but not enough to cover the insured's damages. UIM fills the gap between what the at-fault driver's policy pays and the insured's damages, up to the insured's UIM limit.

States use one of two approaches to measure "underinsured":

• Difference (gap) states: the at-fault driver is underinsured if their liability limit is less than the insured's UIM limit. The insured's recovery is the UIM limit minus the amount paid by the at-fault driver.
• Excess (add-on) states: the at-fault driver is underinsured if their limit is less than the insured's damages, and UIM pays on top of the liability payment up to the UIM limit.

Worked UIM Example (Difference State)

The insured suffers $120,000 in adjudicated bodily injury damages. The at-fault driver carries a $50,000 BI liability limit. The insured carries a $100,000 UIM limit.

• The at-fault driver's insurer pays its $50,000 limit.
• In a difference state, UIM pays the insured's UIM limit minus the at-fault payment: $100,000 - $50,000 = $50,000.
• Total recovery: $50,000 + $50,000 = $100,000. The insured still absorbs $20,000 because total recovery is capped at the $100,000 UIM limit.

Trap: In a difference state the UIM payment is offset by what the negligent driver already paid; students who forget the offset overstate the UIM payout.

The Offset and Anti-Stacking Rules

Part C reduces the insured's UM/UIM recovery by sums already paid by or for the at-fault party and, in many policies, by workers compensation benefits, to prevent double recovery. Stacking (combining limits across multiple vehicles or policies) is permitted in some states and barred by anti-stacking clauses in others; the Declarations and state law control.

UM Property Damage

The base PP 00 01 UM endorsement covers bodily injury only. Some states offer Uninsured Motorist Property Damage (UMPD) to pay for damage to the insured's auto caused by an uninsured driver, usually subject to a deductible (commonly $250). Where Collision coverage is carried, the insured may instead use Part D Collision, then the insurer subrogates against the uninsured driver and may refund the deductible if recovery succeeds.

Why Part C Matters

With roughly one in seven drivers uninsured nationally, and many more carrying only minimum limits, Part C is often the only realistic source of full recovery for a seriously injured insured. Because UM/UIM limits are usually offered up to the insured's own liability limit, agents are expected to explain the coverage and document any rejection in writing where state law requires it.

Settlement Consent and Subrogation Traps

Two procedural traps recur on the exam. First, before an insured settles with the at-fault driver, the PAP UM/UIM endorsement generally requires the insured to notify the UM/UIM insurer and obtain consent; settling without consent can destroy the insurer's subrogation rights and bar the UM/UIM claim. Second, the UM/UIM insurer that pays is subrogated to the insured's claim against the at-fault driver, so any recovery the insured separately obtains may have to be reimbursed. Counseling the insured to coordinate every settlement step with the carrier preserves both the claim and the carrier's recovery rights.

Arbitration of Disputes

The UM endorsement typically provides that disagreements over whether the insured is legally entitled to recover or the amount of damages are resolved by arbitration when both parties agree, or otherwise by suit. This contrasts with liability claims, where the insurer controls the defense. Because UM/UIM is the insured's own coverage, the relationship can become adversarial when the carrier disputes fault or damages, and the arbitration clause sets the process for resolving it.