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🚘 '''Uninsured/underinsured motorist coverage''' is a combined [[Definition:Automobile insurance | automobile insurance]] provision—commonly written as UM/UIM—that protects a [[Definition:Policyholder | policyholder]] against [[Definition:Bodily injury | bodily injury]] losses (and sometimes [[Definition:Property damage | property damage]]) when the at-fault driver either has no [[Definition:Liability insurance | liability insurance]] or carries limits too low to fully compensate the insured's damages. While some [[Definition:Insurance policy | policies]] and state statutes treat uninsured motorist (UM) and underinsured motorist (UIM) as separate coverages with distinct insuring agreements, the industry frequently references them together because they address the same fundamental problem: the financial inadequacy of the other driver's insurance. The vast majority of U.S. states require insurers to offer one or both components, and many mandate their inclusion unless the insured affirmatively rejects them in writing.

⚙️ The coverage operates in two layers. The UM component responds when the at-fault driver has no insurance at all—or when the driver cannot be identified, as in a hit-and-run. The insured's own [[Definition:Insurance carrier | carrier]] evaluates and pays the claim up to the selected UM limit, applying standard [[Definition:Negligence | negligence]] and [[Definition:Damages | damages]] analysis. The UIM component activates when the at-fault driver does have insurance, but the available [[Definition:Policy limit | policy limits]] fall short of the insured's total damages. How UIM interacts with the at-fault driver's coverage depends on state law: some states allow the insured to "stack" their UIM limits on top of the at-fault driver's payment, while others apply a "difference in limits" method where UIM only pays if the insured's UIM limit exceeds the at-fault driver's liability limit. These variations create meaningful complexity for [[Definition:Claims adjuster | claims adjusters]] and for [[Definition:Policy administration system (PAS) | policy administration systems]] that must accurately calculate benefits across jurisdictions.

📋 For [[Definition:Insurance carrier | carriers]] and [[Definition:Insurtech | insurtechs]] operating in personal auto, UM/UIM coverage is one of the most compliance-intensive elements of the product. Mandatory offer requirements, signed rejection forms, minimum limit rules, and [[Definition:Stacking | stacking]] regulations differ by state and sometimes by court interpretation, creating a patchwork that demands careful attention during product design and [[Definition:Rate filing | rate filing]]. From a financial perspective, UM/UIM [[Definition:Loss reserve | reserves]] can be volatile because the severity of claims—especially those involving serious injuries and the UIM layer—tends to be high, and resolution timelines are extended by [[Definition:Arbitration | arbitration]] proceedings or litigation over coverage applicability. Actuaries pricing this coverage must account for both the insured's own risk characteristics and the external variable of uninsured and underinsured driver prevalence in each [[Definition:Rating territory | rating territory]], making it one of the more analytically challenging coverages in the auto line.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Uninsured motorist coverage (UM)]]
* [[Definition:Underinsured motorist coverage (UIM)]]
* [[Definition:Automobile insurance]]
* [[Definition:Stacking]]
* [[Definition:Bodily injury]]
* [[Definition:Rating territory]]
{{Div col end}}

Definition:Uninsured/underinsured motorist coverage - Revision history

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