6.4 Part C Uninsured/Underinsured Motorists

Part C - Uninsured and Underinsured Motorists

Part C protects covered persons when the at-fault driver has no insurance or not enough insurance. It is a first-party coverage that pays what the insured would have been able to collect from the negligent party had that party carried adequate liability limits. Most states require insurers to offer UM coverage, and many require the insured to reject it in writing to decline it.

UM versus UIM

• Uninsured Motorists (UM): the at-fault driver has no liability insurance, the policy was invalid, or the driver is a hit-and-run ("phantom vehicle") who cannot be identified. UM coverage in the ISO form is primarily for bodily injury; some states add UMPD (property damage).
• Underinsured Motorists (UIM): the at-fault driver has insurance, but the limits are lower than the injured insured's damages (or lower than the insured's own UIM limit, depending on state trigger).

Trap: A hit-and-run driver triggers UM, not UIM - there is no identified policy to be 'under.' Physical contact (or, in some states, corroborated phantom-vehicle evidence) is typically required for a hit-and-run UM claim.

Two UIM Trigger Approaches

States use one of two methods to decide when UIM applies and how much it pays:

Worked example (limits/difference-in-limits state): Insured carries $100,000 UIM. The at-fault driver carries $25,000 in BI liability and pays it in full. The insured's damages are $90,000. UIM pays $100,000 - $25,000 = $75,000, so the insured collects $25,000 + $75,000 = $100,000, but only up to actual damages of $90,000, so total recovery is $90,000 ($25,000 from the other driver + $65,000 UIM).

Conditions and Stacking

Key Part C rules tested on exams:

• Arbitration: if the insurer and insured disagree on whether the insured is legally entitled to recover, or the amount, the matter may go to arbitration.
• Consent to settle: the insured generally must not settle with the at-fault party without the UIM insurer's consent, or the insurer may lose its subrogation rights and deny the claim.
• Stacking: in some states, an insured with multiple vehicles or policies may stack (add together) UM/UIM limits across vehicles, multiplying available coverage. Many policies contain anti-stacking language where state law allows it.

Trap: UIM does not stack on top of the at-fault driver's limit dollar-for-dollar in a difference-in-limits state - the at-fault payment is subtracted from the UIM limit, not added to it.

Who Is Covered and Property Damage

The definition of insured under Part C mirrors Part B: the named insured and family members are covered in any auto and as pedestrians, while other occupants are covered only in your covered auto. UM coverage in the base ISO form addresses bodily injury; the insured's own medical, lost wages, and pain-and-suffering claims that the negligent uninsured driver cannot pay.

Some states add Uninsured Motorists Property Damage (UMPD) for damage to the insured's vehicle caused by an uninsured at-fault driver, frequently with a deductible. Where UMPD is unavailable, the insured looks to Part D collision coverage instead.

Offer, Rejection, and Limit Selection

State law strongly shapes Part C. Most states require the insurer to offer UM/UIM at limits equal to the liability limits the insured purchases. To buy lower UM/UIM limits - or to reject the coverage entirely where rejection is allowed - the insured must usually sign a written rejection or selection form. If no valid written rejection is on file, courts in many states will read UM/UIM into the policy at the full liability limit by operation of law.

Trap: An oral 'no thanks' does not waive UM/UIM where a signed rejection is required; the insurer may be forced to provide it at the liability limit.

Exclusions and Coordination

Part C contains exclusions that prevent overlap and abuse:

• The owner of an uninsured/underinsured vehicle is not an insured for UM/UIM while occupying that vehicle - you cannot use UM to cover injuries in your own uninsured car.
• UM/UIM does not apply if the insured settles without consent, defeating the insurer's subrogation rights.
• Benefits are reduced by amounts paid by or for the at-fault party and by applicable workers' compensation or disability benefits, again to prevent double recovery.

Because UM/UIM is first-party coverage but measures damages by what the insured could have recovered in a liability action, the adjuster must establish both the at-fault driver's negligence and the dollar value of the insured's injuries - which is why arbitration of disputed UM/UIM claims is common.

Property Damage UM and the "Phantom Vehicle" Rule

In some states Part C includes uninsured motorists property damage (UMPD) to repair the insured's vehicle when struck by an uninsured at-fault driver, often subject to a deductible; in others, collision coverage handles that loss instead. A recurring trap is the hit-and-run ("phantom vehicle") claim: UM coverage can apply when an unidentified driver causes injury, but many states require physical contact or independent corroboration to prevent fraudulent "I swerved to avoid a car that drove off" claims.

Underinsured-motorist coverage uses either a limits trigger (the at-fault limit is below the insured's UIM limit) or a damages trigger (damages exceed the at-fault limit), and the offset/excess approach determines how much the UIM insurer ultimately pays.