6.4 Part C Uninsured/Underinsured Motorists

Part C — Uninsured/Underinsured Motorists

Part C pays compensatory damages the insured is legally entitled to recover from the owner or operator of an uninsured (UM) or underinsured (UIM) motor vehicle, because of bodily injury. It steps into the shoes of a missing or inadequate liability policy on the other driver. UM/UIM is first-party in form but liability-like in substance: the insured must prove the other driver was at fault and the amount of damages.

Uninsured vs. Underinsured

• Uninsured motor vehicle: the at-fault vehicle has no liability insurance, has insurance below the state-required minimum, is a hit-and-run vehicle whose driver cannot be identified, or whose insurer is insolvent.
• Underinsured motor vehicle: the at-fault vehicle is insured, but its liability limits are less than the injured insured's damages (or, in some states, less than the insured's own UIM limit).

UM is the more commonly tested base; many states bundle UM and UIM and require insurers to offer the coverage, with the insured allowed to reject it only in writing.

Insureds and What Is Covered

Insureds under Part C are the same broad group: you, family members, and any other person occupying your covered auto, plus anyone entitled to recover because of injury to those persons. Part C generally covers bodily injury only; UMPD (uninsured-motorist property damage) is an optional add-on available in some states. The PAP form pays for BI and does not cover the insured's own vehicle damage under Part C unless UMPD is endorsed.

UIM Limits — Two Statutory Approaches

States calculate underinsured benefits one of two ways, and the difference is a heavily tested numeric:

• Difference (excess) approach: UIM limit minus the at-fault driver's liability limit = the most UIM adds on top.
• Limits-trigger / reduction approach: UIM applies only if the insured's UIM limit exceeds the other driver's liability limit; the UIM payment is reduced by what the at-fault driver pays.

Worked example (difference approach): Insured has $100,000 UIM. Damages = $130,000. At-fault driver carries $50,000 liability and pays it.

• At-fault driver pays $50,000.
• UIM available on top = $100,000 (UIM limit). Remaining damages after the $50,000 = $80,000.
• UIM pays the lesser of remaining damages ($80,000) or UIM limit ($100,000) → $80,000.
• Total recovery = $50,000 + $80,000 = $130,000 (fully indemnified).

Reduction-Approach Variation and Traps

Under the reduction approach, using the same facts ($100,000 UIM, $50,000 paid by at-fault driver, $130,000 damages):

• UIM limit $100,000 − $50,000 already paid = $50,000 UIM payment.
• Total recovery = $50,000 + $50,000 = $100,000 (insured absorbs the $30,000 gap).

Exam traps:

• A vehicle is not underinsured if its liability limit equals or exceeds the insured's UIM limit (in reduction states).
• A hit-and-run with no physical contact may be denied UM in some states unless corroborated — know your state's contact rule.
• UM/UIM does not stack with the at-fault driver's payment beyond the insured's actual damages — it is not a windfall.

Quick Comparison Table

Uninsured vs. Underinsured Motorists

Part C is first-party coverage that steps into the shoes of a negligent at-fault driver who cannot pay. The two triggers are distinct:

What UM/UIM Pays - and the Fault Requirement

UM/UIM pays damages the insured is legally entitled to recover from the owner/operator of the uninsured or underinsured vehicle - meaning the other driver must be at fault. It covers bodily injury in every state and property damage in some. The coverage follows the person (named insured and family members in any auto, plus occupants of the covered auto), not just the vehicle.

Stacking, Offsets, and Limits

Two recurring concepts: stacking lets an insured combine UM limits across multiple vehicles or policies where state law permits, multiplying available coverage; and the UIM offset/credit reduces the UIM recovery by the amount already collected from the at-fault driver's liability insurer (or measures UIM as the difference between the insured's UIM limit and the tortfeasor's liability limit, depending on the state's "limits" vs. "damages" approach).

Why Insurers Must Offer It

Most states require the insurer to offer UM/UIM at limits equal to the liability limits, and the insured must reject it in writing to carry less or none. This statutory-offer rule appears on both the national and state portions of the exam; on the Montana portion, the candidate should connect it to the state's specific uninsured-motorist requirements rather than assume the generic rule controls.