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Uninsured & Underinsured Motorist Coverage Explained

What UM and UIM coverage are designed to address when another driver has no insurance or not enough insurance.

LowestPriceFinder Editorial Team · Reviewed August 27, 2026

Important: Insurance requirements, availability, rating practices and policy terms vary by state and insurer. Verify details that apply to you.

What is uninsured motorist coverage?

Uninsured motorist coverage is designed to provide protection, subject to policy terms, when an at-fault driver does not have applicable liability insurance. The exact protection can differ by state and policy.

What is underinsured motorist coverage?

Underinsured motorist coverage may apply when the at-fault driver's liability limits are insufficient for a covered loss. How benefits are calculated depends on the jurisdiction and contract.

Bodily injury and property damage

Some states or insurers distinguish between uninsured/underinsured motorist bodily injury and property-damage protection. Availability and required limits are not uniform nationwide.

Is UM/UIM required?

Requirements vary significantly. Some states require an offer, some require coverage unless it is rejected in a permitted manner, and others have different rules. Verify current requirements with your state insurance department or licensed professional.

How to compare UM/UIM

When comparing quotes, confirm whether UM/UIM is included, the limits, whether a deductible applies to any property-damage component, and how the coverage interacts with other policy provisions.

HOW THIS GUIDE WAS PREPARED

Prepared by the LowestPriceFinder Editorial Team using consumer guidance from insurance regulators and the NAIC. See our Editorial Standards & Research Policy.

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