6.4 Part C Uninsured/Underinsured Motorists

What Part C Protects Against

Part C - Uninsured Motorists Coverage (UM) pays the insured's own bodily injury damages when those damages are caused by an uninsured at-fault driver. Underinsured Motorists (UIM) coverage extends the same protection when the at-fault driver carries liability limits that are lower than the injured insured's damages.

The essential exam concept: Part C steps into the shoes of the missing or inadequate liability insurance of the other driver. The insured must be legally entitled to recover from the at-fault party - meaning the other driver must be at fault and the insured's damages must be established.

What Counts as an Uninsured Motor Vehicle

An uninsured motor vehicle includes one that:

• Has no applicable BI liability bond or policy at the time of the accident;
• Carries liability below the state-required minimum;
• Is a hit-and-run vehicle whose operator/owner cannot be identified; or
• Is insured by a company that is insolvent or denies coverage.

A common trap: a vehicle owned/operated by a self-insurer or a government entity, or one owned by the named insured, is generally not an uninsured motor vehicle under the UM definition.

UM and UIM cover bodily injury only under the standard PAP. Some states add an optional Uninsured Motorists Property Damage (UMPD) coverage for damage to the insured's auto caused by an uninsured driver, but the base Part C insuring agreement responds to BI. Candidates who assume Part C automatically repairs the insured's vehicle are making a tested error — physical damage to the insured's own auto belongs under Part D unless UMPD is specifically added by endorsement or state mandate.

UM vs. UIM: The Coverage Gap Math

UIM is the more heavily tested numeric. Most states use a 'difference in limits' approach, though some use a 'difference in damages' (excess) approach. Know the dominant difference-in-limits method.

Worked example (difference-in-limits): The insured carries $100,000 UIM. The at-fault driver carries $25,000 liability. The insured's proven damages are $90,000.

The insured is made whole because total damages ($90,000) are below the UIM limit. If damages were $130,000, the insured would collect $25,000 + $75,000 = $100,000 and absorb the remaining $30,000.

A frequent trap: UIM applies only when the at-fault driver's limits are lower than the insured's UIM limit. If the at-fault driver carried $100,000 and the insured carried $100,000 UIM, there is no UIM gap to fill - the coverages are equal.

Limits, Stacking, and Conditions

Part C limits are usually written the same way the insured's Part A is written (split or CSL). Several conditions and traps are tested:

• No duplicate recovery: amounts paid under Part B (Med Pay) or under workers compensation are not also paid under Part C - the policy reduces the UM/UIM payment by those amounts.
• Stacking: depending on state law and policy language, an insured with multiple insured autos may or may not stack (add together) per-vehicle UM limits. The PAP includes anti-stacking language, but state statutes can override it.
• Arbitration: if the insurer and insured disagree on whether the insured is legally entitled to recover or on the amount, either party may demand arbitration under the UM provisions.
• Hit-and-run proof: UM for a phantom/hit-and-run vehicle typically requires prompt reporting and, in many states, physical contact or independent corroboration.

Rejection of Coverage

UM coverage is mandatory in most states and is automatically included unless the insured rejects it in writing. UIM is frequently offered alongside. An applicant who wants to decline must sign a written waiver; otherwise the coverage attaches at limits equal to the liability limits (subject to state rules).

A final tested distinction: UM responds when the other driver has no coverage (or is a hit-and-run or insolvent insurer), while UIM responds when the other driver has coverage but not enough. Both require the insured to be legally entitled to recover, both pay the insured's own bodily injury, and both can be reduced by Med Pay and workers comp. The deciding question on any Part C item is simply whether the at-fault driver had zero coverage (UM) or merely insufficient coverage (UIM).

Hit-and-Run and Phantom Vehicles

Part C treats a hit-and-run vehicle whose owner cannot be identified as an uninsured motor vehicle, so UM responds to the insured's bodily injury. Many states require physical contact (or independent corroborating evidence) for a "phantom vehicle" claim, to deter fraud — a tested nuance. UM does not cover a vehicle owned by or furnished for the regular use of the insured, nor a self-insured government vehicle in some states.

UIM Gap Math — Worked Example

The insured carries 100/300 UIM. An at-fault driver has only $50,000 in liability coverage; the insured's injuries are valued at $120,000.

In a "difference" (reduction) state, the UIM limit is reduced by the at-fault payment ($100,000 - $50,000 = $50,000 available). In an "excess/add-on" state, UIM stacks on top, paying the full $70,000. Knowing which approach a state uses is essential.

Rejection, Stacking, and Limits

UM/UIM must usually be offered at limits equal to the liability limit and can be rejected or reduced only in writing. Stacking (combining limits across multiple vehicles or policies) is permitted in some states and barred by anti-stacking clauses in others.