Underinsured Motorist Coverage is an optional auto insurance policy add-on that compensates policyholders when another driver causes an accident but lacks sufficient liability insurance to cover the full cost of injuries, medical bills. Or property damage. This coverage bridges the gap between the at-fault driver’s policy limits and the actual expenses incurred by the injured party.
Category
Auto insurance coverage
Used for
Covering medical bills, lost wages. And property damage after an accident
Common confusion
Often mistaken for Uninsured Motorist Coverage, which applies when the at-fault 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 designed to protect drivers when they're involved in an accident caused by another motorist whose liability insurance limits are too low to cover the resulting expenses. In Georgia, like many states, drivers are required to carry minimum liability insurance. But these minimums often fall short of covering serious injuries or extensive property damage. For example, if a driver with the state-mandated minimum coverage causes an accident that results in ,000 in medical bills. But their policy only covers ,000, UIM can cover the remaining ,000 if the injured party has this coverage.
Related glossary terms: Uninsured Motorist Coverage, Liability Insurance, Personal Injury Protection.
UIM is not automatically included in standard auto insurance policies. Instead, it must be purchased as an add-on, often alongside Uninsured Motorist Coverage (UM). While UM covers accidents where the at-fault driver has no insurance at all, UIM specifically addresses situations where the at-fault driver’s insurance is insufficient. This distinction is important because it determines when the coverage applies and how claims are processed. Policyholders can typically choose their UIM limits, which are usually tied to their liability coverage limits. Though lower limits can sometimes be selected to reduce premiums.
When an accident occurs, the first step is to determine whether the at-fault driver’s insurance is sufficient to cover the damages. If the at-fault driver’s policy limits are exhausted, the injured party’s UIM coverage can be activated. For instance, if the at-fault driver’s policy covers ,000 in bodily injury per person but the injured party’s medical bills total ,000, UIM can cover the ,000 difference, assuming the policyholder’s UIM limit's high enough. The process involves filing a claim with the injured party’s own insurance company, which then reviews the details of the accident, the at-fault driver’s insurance limits. And the extent of the damages.
UIM coverage is typically subject to a few key conditions. First, the at-fault driver’s insurance must be legally confirmed as insufficient to cover the damages. Second, the injured party’s UIM limits must exceed the at-fault driver’s liability limits for the coverage to apply. For example, if both drivers have ,000 in liability coverage, UIM would not kick in because there is no gap to cover. And UIM claims may be subject to deductibles, depending on the policy. And the insurance company may require documentation such as medical records, police reports. And proof of the at-fault driver’s insurance limits.

Underinsured Motorist Coverage is critical because it provides financial protection in scenarios where the at-fault driver’s insurance is inadequate. Without UIM, injured parties may be forced to cover the remaining costs out of pocket, which can lead to significant financial strain, especially in cases involving serious injuries or long-term medical care. For example, a severe accident could result in hundreds of thousands of dollars in medical bills, lost wages. And rehabilitation costs, far exceeding the minimum liability coverage required by law. UIM ensures that policyholders are not left vulnerable to these expenses, even when the other driver is underinsured.
Another reason UIM matters is that it offers clear next steps. Many drivers assume that other motorists carry sufficient insurance. But That means not always the case. In Georgia, the minimum liability coverage is ,000 per person for bodily injury, ,000 per accident for bodily injury. And ,000 for property damage. These amounts may not cover the full cost of an accident, particularly in urban areas like Atlanta where medical costs and vehicle repair expenses can be high. UIM helps bridge this gap, ensuring that policyholders are protected regardless of the other driver’s insurance situation.
Underinsured Motorist Coverage becomes particularly important in situations where the injuries or damages from an accident are severe. For example, if a driver sustains a traumatic brain injury, multiple fractures. Or requires extensive physical therapy, the medical costs can quickly exceed the at-fault driver’s policy limits. UIM can cover the difference, allowing the injured party to focus on recovery without the added stress of financial hardship. This coverage is also valuable in hit-and-run accidents where the at-fault driver is identified but lacks sufficient insurance. Or in multi-vehicle collisions where the combined damages exceed the responsible party’s coverage.
UIM is also critical in states with high rates of underinsured drivers. While Georgia requires all drivers to carry liability insurance, enforcement can be inconsistent. And some drivers may carry only the minimum required coverage. In urban areas like Atlanta, where traffic congestion increases the likelihood of accidents, the risk of encountering an underinsured driver is higher. And UIM can be beneficial for pedestrians, cyclists. Or passengers who are injured in an accident caused by an underinsured driver, as it provides an additional layer of protection beyond their own health insurance or personal injury protection (PIP) coverage.
Uninsured Motorist Coverage applies when the at-fault driver has no insurance. While Underinsured Motorist Coverage applies when the at-fault driver’s insurance is insufficient to cover the damages.
PIP covers medical expenses and lost wages regardless of fault. While Underinsured Motorist Coverage only applies when the other driver is at fault and underinsured.
Liability insurance covers damages you cause to others. While Underinsured Motorist Coverage protects you when another driver’s liability insurance is inadequate.
Underinsured Motorist Coverage is often overlooked but can be a lifeline after a serious accident. Many drivers assume their health insurance will cover medical bills. But health insurance may not cover all accident-related expenses, such as lost wages or long-term care. UIM fills this gap, making it a smart addition to any auto policy.
After a rear-end collision in Atlanta, Maria suffered a herniated disc and required surgery costing ,000. The at-fault driver’s insurance policy only covered ,000 in bodily injury.
Uninsured Motorist Coverage is an optional auto insurance protection that pays for medical bills, lost wages. And other damages when the at-fault driver has no liability insurance or flees the scene. It also applies if the driver’s policy limits are too low to cover the full cost of injuries or property damage sustained in the crash.
Liability insurance helps pay for harm you cause others. It covers legal costs, medical bills. And damage payments up to your policy limit. Georgia and most states require drivers to have it. This makes sure victims get money after accidents.
Personal Injury Protection is auto insurance. It pays for medical bills, lost pay. And other costs. It covers you and passengers. It does not matter who caused the crash. It is called 'no-fault' because it pays fast. It helps with hospital bills and rehab.
Med Pay is car insurance that pays for medical bills after a crash. It works no matter who caused the crash. It covers the driver, passengers. And sometimes pedestrians or cyclists hit by the car. It pays up to the policy limit. It pays fast and does not need proof of fault.
Third-Party Claim is a legal demand made by an injured person against the at-fault driver’s insurance company, not their own. It seeks compensation for medical bills, lost wages, pain and suffering. And property damage caused by the other driver’s negligence. Unlike a first-party claim, it involves dealing with someone else’s insurer.
Atlanta Auto Law
Contact Atlanta Auto Law for practical guidance on Underinsured Motorist Coverage and related personal injury lawyer work in Atlanta.