Underinsured Motorist Coverage is an optional auto insurance protection that pays for medical bills, lost wages. And other damages when the at-fault driver’s liability limits are too low to cover the full cost of injuries. This coverage bridges the gap between the other driver’s policy limits and the actual expenses incurred by the injured party.
Category
Auto insurance coverage
Used for
Covering medical and financial losses after an accident
Common confusion
Often mistaken for Uninsured Motorist Coverage, which applies when the other driver has no insurance
Also called
UIM, Underinsured Motorist Insurance
Often discussed with
Car Accident Lawyer, Hit-and-Run Accident Lawyer

Underinsured Motorist Coverage (UIM) is a type of auto insurance that protects drivers and passengers when they're injured in an accident caused by another driver whose liability insurance limits are insufficient to cover the full cost of damages. While most states require drivers to carry a minimum amount of liability insurance, these limits are often too low to cover serious injuries, medical treatments. Or lost wages. UIM coverage steps in to pay the difference between the at-fault driver’s policy limits and the actual expenses incurred by the injured party.
Related glossary terms: Personal Injury Protection, Economic Damages, Non-Economic Damages.
UIM coverage is not automatically included in standard auto insurance policies. Drivers must typically add it as an optional protection. Though some states require insurers to offer it. The coverage applies to medical expenses, rehabilitation costs, pain and suffering. And lost income, among other damages. It may also cover injuries sustained by passengers in the insured vehicle or pedestrians struck by an underinsured driver. Unlike health insurance, UIM coverage is designed specifically to address the financial gaps left by inadequate liability coverage from the at-fault driver.
When an accident occurs, the at-fault driver’s insurance company will pay up to the limits of their liability coverage. If those limits are exhausted and the injured party’s expenses exceed that amount, the injured party’s own UIM coverage can be activated. For example, if the at-fault driver has ,000 in bodily injury liability coverage but the injured party’s medical bills total ,000, the injured party’s UIM coverage could pay the remaining ,000, assuming their UIM limits are high enough.
A practical next step is UIM coverage is typically subject to limits chosen by the policyholder, such as ,000 per person or 0,000 per accident. These limits determine the maximum amount the insurance company will pay for covered damages. To use UIM coverage, the injured party must first exhaust the at-fault driver’s liability limits. Some policies also require the injured party to notify their insurer of the accident and provide documentation of the damages and the at-fault driver’s insurance limits. The process may involve negotiations with the insurance company to determine the fair value of the claim.
It’s important to note that UIM coverage doesn't cover property damage, such as repairs to a vehicle. Separate coverage, like collision insurance, is needed for vehicle repairs. And UIM coverage may not apply if the injured party has already received compensation from other sources, such as health insurance or disability benefits, unless the policy includes provisions for coordination of benefits.

Underinsured Motorist Coverage matters because accidents involving serious injuries can result in expenses far exceeding the minimum liability limits required by most states. Medical treatments, surgeries, physical therapy. And lost wages can quickly add up, leaving injured parties with significant financial burdens. Without UIM coverage, injured parties may have to rely on their own health insurance, savings. Or legal action to recover the remaining costs, which can be time-consuming and uncertain.
UIM coverage provides a layer of financial security by ensuring that injured parties have access to additional funds to cover their losses. It can also reduce the need for lengthy legal battles to recover damages from an at-fault driver who lacks sufficient assets or insurance. For drivers with high-deductible health insurance or limited savings, UIM coverage can be especially valuable, as it helps avoid out-of-pocket expenses that could lead to financial hardship.
Underinsured Motorist Coverage matters most in situations where the at-fault driver’s insurance limits are too low to cover the full extent of injuries or damages. This is common in accidents involving severe injuries, such as traumatic brain injuries, spinal cord injuries. Or multiple fractures, which often require extensive medical treatment and rehabilitation. Even minor injuries can result in high medical bills, especially if follow-up care or physical therapy is needed.
UIM coverage is also critical in cases where the at-fault driver carries only the state-mandated minimum liability limits. For example, Georgia requires drivers to carry a minimum of ,000 per person and ,000 per accident for bodily injury liability. If multiple passengers are injured, the per-accident limit may be exhausted quickly, leaving little or no coverage for additional claimants. UIM coverage can help ensure that all injured parties receive fair compensation, regardless of the at-fault driver’s policy limits.
Other scenarios where UIM coverage is valuable include hit-and-run accidents, where the at-fault driver can't be identified. Or accidents involving drivers who are underinsured due to financial constraints. In these cases, UIM coverage can provide a safety net, allowing injured parties to focus on recovery rather than worrying about how to pay for their medical bills and other expenses.
Uninsured Motorist Coverage applies when the at-fault driver has no insurance at all. While Underinsured Motorist Coverage applies when the at-fault driver’s insurance limits are too low to cover the damages.
Personal Injury Protection covers medical expenses and lost wages regardless of who is at fault. While Underinsured Motorist Coverage specifically addresses gaps left by the at-fault driver’s insufficient insurance.
Liability insurance covers damages caused by the policyholder to others. While Underinsured Motorist Coverage protects the policyholder when another driver’s liability insurance is inadequate.
Underinsured Motorist Coverage is often overlooked but can be critical in protecting against financial hardship after an accident. Many drivers assume their health insurance will cover all medical expenses. But health insurance may not cover all costs, such as lost wages or pain and suffering. UIM coverage fills these gaps and provides clear next steps.
After a rear-end collision, Sarah suffered a broken leg and required surgery. The at-fault driver’s insurance covered only ,000 of her ,000 in medical bills. Because Sarah had Underinsured Motorist Coverage with a ,000 limit, her own insurance paid the remaining ,000, allowing her to focus on recovery without financial stress.
Personal Injury Protection is a type of auto insurance coverage that pays for medical expenses, lost wages. And other related costs for the policyholder and passengers after a car accident, regardless of who caused the crash. It's often called 'no-fault' coverage because it applies no matter who is at fault. Limits and benefits vary by state and policy.
Economic Damages are financial losses that can be calculated with receipts, bills, pay stubs. Or expert reports after an injury. Economic Damages include medical bills, lost wages, property repair costs. And other out-of-pocket expenses caused by another party’s negligence or wrongdoing. Courts award Economic Damages to restore the injured person to the financial position they would have been in without the injury.
Non-Economic Damages are compensation awarded in personal injury cases for losses that don't have a direct monetary value. These include pain and suffering, emotional distress, loss of enjoyment of life, disfigurement. And loss of consortium. Unlike medical bills or lost wages, these damages address the intangible harm a person experiences after an injury.
Comparative Negligence is a legal rule used in personal injury cases to determine how much fault each party shares when an accident occurs. Under this rule, a person who is partly at fault for their own injuries can still recover damages. But the amount is reduced by their percentage of fault. This system aims to allocate responsibility fairly between all involved parties.
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