6.4 Part C Uninsured/Underinsured Motorists

Purpose of Part C

Part C - Uninsured Motorists Coverage (and, where added, Underinsured Motorists Coverage) pays the bodily injury damages an insured is legally entitled to recover from the owner or operator of an uninsured or underinsured auto. It is first-party coverage: the insured's own policy steps in because the responsible party cannot fully pay.

The insured must be legally entitled to recover - meaning the other driver must be at fault. If the insured caused the accident, Part C does not respond.

What Counts as an Uninsured Motor Vehicle

For UM purposes, an uninsured motor vehicle is one:

• With no liability insurance at the time of the accident.
• Insured for less than the state-required minimum limits.
• A hit-and-run vehicle whose owner or driver cannot be identified.
• Insured by a company that is or becomes insolvent (bankrupt).

A vehicle is not uninsured if it is owned by or furnished for the regular use of the named insured or a family member, nor if it is a self-insured government vehicle in most editions.

Underinsured Motorist Coverage

Underinsured motorist (UIM) coverage applies when the at-fault driver does carry liability insurance, but that limit is less than the insured's damages (or, in some states, less than the insured's own UIM limit). UIM tops up the shortfall up to the insured's UIM limit.

The most-tested point is how UIM pays: it generally pays the difference between the insured's UIM limit and the amount actually recovered from the at-fault driver - it is not stacked on top of the full UIM limit.

UIM Worked Example

Assume the insured carries a $100,000 UIM limit and suffers $100,000 in proven bodily injury damages. The at-fault driver carries only a $25,000 liability limit.

The insured collects $25,000 + $75,000 = $100,000 total - their full damages, but no more. Trap: a 'difference' UIM does not pay the full $100,000 on top of the $25,000.

Scope, Limits, and Property Damage

Key rules producers must remember:

• Part C covers bodily injury to the insured and family members in any auto, and to others occupying the covered auto.
• Standard Part C does not cover physical damage to the insured's vehicle. Some states add Uninsured Motorist Property Damage (UMPD) by endorsement or statute.
• Many states require insurers to offer UM/UIM, and the insured may have to reject it in writing to go without it.
• Disputes over fault or the amount of damages are typically resolved through the policy's arbitration provision.

Because UM/UIM availability and stacking rules vary, state law modifies this national framework - that detail belongs in the state chapters.

Hit-and-Run and Phantom Vehicles

A frequent exam point: UM does cover a hit-and-run vehicle whose owner or driver cannot be identified, provided there is physical contact in most editions and states. The insured must usually report the accident promptly to police and the insurer.

Some states recognize a phantom vehicle (a car that forces an accident without touching the insured), but many editions require actual physical contact to prevent fraudulent 'a car ran me off the road' claims. When a question hinges on no contact, the default ISO answer leans toward requiring contact unless state law says otherwise.

Who Is an Insured and What Triggers Part C

Part C insureds mirror the liability Part:

• You and family members while occupying any auto or as pedestrians struck by an uninsured auto.
• Any other person occupying your covered auto.
• Anyone entitled to recover because of bodily injury to those insureds (for example, a surviving spouse's loss-of-consortium claim).

Four conditions must align for Part C to pay: the other driver is uninsured or underinsured, that driver is legally at fault, the insured suffers bodily injury, and the insured is legally entitled to recover damages. Remove any one and Part C does not respond.

Limits, Offsets, and Stacking

Part C limits are written like liability limits - split (for example 100/300) or combined. Several mechanics recur on exams:

• Offset: UIM benefits are typically reduced by amounts already recovered from the at-fault driver (the 'difference' approach) or by Med Pay paid for the same injury element.
• Stacking: In some states, an insured with multiple covered autos may stack (add together) UM/UIM limits across vehicles; other states prohibit it via an anti-stacking clause.
• Arbitration: If the insurer and insured disagree on fault or amount, the policy's arbitration provision controls.

Because offset and stacking rules are state-driven, the national exam tests the general framework while state chapters supply the local variations.

Finally, distinguish UM from UIM cleanly: UM answers when the at-fault driver has no insurance (or is a hit-and-run or insolvent insurer); UIM answers when the at-fault driver has some insurance but not enough. A question stating 'the other driver carried the state-minimum 25/50 limits but caused $90,000 in injuries' is a UIM scenario, because liability coverage existed but fell short of the insured's damages.