6.4 Part C Uninsured/Underinsured Motorists

What Part C does

Part C - Uninsured Motorists (UM) (often expanded to Uninsured/Underinsured Motorists, UM/UIM) flips the relationship of Part A. Instead of paying others when the insured is at fault, Part C pays the insured the damages the insured is legally entitled to recover from the owner or operator of an uninsured or underinsured motor vehicle who caused the injury.

The key phrase is "legally entitled to recover": the other driver must be at fault, and the insured collects from their own policy because the responsible party cannot pay. Part C is therefore a first-party coverage that resolves a third-party liability shortfall.

Uninsured versus underinsured vehicles

A hit-and-run vehicle is covered as uninsured, but states impose proof rules: many require physical contact with the hit-and-run vehicle, or independent corroboration of a phantom vehicle, to prevent fraudulent single-car claims. UM does not apply to a vehicle owned by or furnished for the regular use of the insured.

UIM offset worked example

Underinsured Motorists coverage handles the gap when the at-fault driver carries some insurance but not enough. States use one of two offset methods, and exam questions usually follow the common limits-offset approach.

Example. The insured suffers $80,000 in proven damages. The at-fault driver carries the state minimum BI limit of $25,000. The insured's own UIM limit is $50,000.

• The insured first collects $25,000 from the at-fault driver's liability insurer.
• Under the limits-offset rule, UIM pays the insured's UIM limit minus the recovered amount: $50,000 - $25,000 = $25,000.
• Total recovered = 25,000 + 25,000 = $50,000. The insured absorbs the remaining $30,000 because total recovery is capped at the UIM limit.

A state using a damages-offset/excess rule could instead let UIM pay up to the limit on top of the underlying recovery; always apply the method the question states.

Bodily injury, property damage, and the offer requirement

UM/UIM most commonly pays for bodily injury. Uninsured Motorists Property Damage (UMPD) is a separate coverage that pays for damage to the insured's auto caused by an uninsured driver; it is state-optional and frequently carries a deductible, and where collision coverage exists it may be unnecessary.

Most states make UM/UIM coverage a mandatory offer: the insurer must offer limits at least equal to the liability limits, and the applicant may reject the coverage or select lower limits only in writing. If a question shows no signed rejection, the safe inference is that UM/UIM applies at the offered amount. Stacking (combining limits across multiple covered autos) is permitted in some states and barred by anti-stacking clauses in others.

Who is an insured and arbitration

The Part C insured definition mirrors the other parts: you and family members, plus any other person occupying your covered auto, and any person entitled to recover damages because of injury to one of those insureds (for example a spouse's loss-of-consortium claim).

Part C contains a distinctive arbitration provision. If the insurer and insured disagree on whether the insured is legally entitled to recover or on the amount of damages, either party may demand arbitration. This is unusual because most coverage disputes go to court; UM/UIM uses arbitration precisely because the at-fault stranger is not a party to the suit. Watch for a question where the insured and insurer dispute fault or damages and the correct procedural answer is arbitration, not a lawsuit against the phantom driver.

Common UM/UIM traps and a quick checklist

Keep these distinctions sharp:

• UM/UIM requires the other driver to be at fault; it is not a no-fault benefit like Part B.
• A vehicle owned by or furnished for regular use to the insured is not an uninsured motor vehicle, so you cannot collect UM against your own uninsured second car.
• Underinsured means the at-fault driver had some insurance but less than needed; uninsured means none (or a hit-and-run/insolvent insurer).
• Property damage to the insured's auto from an uninsured driver belongs under UMPD or Collision, not under UM bodily injury.

Checklist for a Part C question: (1) Is the other driver at fault? (2) Did the other driver have no insurance, too little, or flee? (3) Is the injured person an insured? (4) Apply the state offset method to compute the dollars. Running these four steps prevents the most common scoring errors on the national portion.

UM vs. UIM and Stacking

The trigger separates the two coverages. Uninsured Motorists (UM) applies when the at-fault driver has no liability insurance, is a hit-and-run that cannot be identified, or whose insurer becomes insolvent. Underinsured Motorists (UIM) applies when the at-fault driver has insurance but less than enough to cover the injured insured's damages.

Offset rules vary by state and are testable: a reduction (offset) state subtracts the at-fault driver's liability limit from the UIM limit; an excess/add-on state lets UIM stack on top of the at-fault limit. Stacking of UM/UIM across multiple owned vehicles may be allowed or barred depending on state law and anti-stacking policy language. Many states require the insurer to offer UM/UIM and allow rejection only in writing.