Discovering that the driver who hit you doesn't carry enough insurance to cover your damages is a frustrating turn after an already difficult accident. Underinsured motorist coverage exists precisely for this situation, stepping in to help fill the gap between what the at-fault driver's policy pays and what your damages actually total.
What Underinsured Motorist Coverage Does
Underinsured motorist coverage, often shortened to UIM, is a type of first-party auto insurance that pays out when the at-fault driver has insurance, but not enough of it to cover your losses. This differs from having no coverage at all, which typically falls under a related but separate category called uninsured motorist coverage.
In practical terms, if you're seriously injured and the at-fault driver's liability policy limit is exhausted well before your medical bills, lost wages, and other damages are covered, UIM coverage can potentially pay the remaining difference, up to your own policy's limits.
How Underinsured Motorist Claims Typically Work
The process generally unfolds in a few stages:
- You first pursue a claim against the at-fault driver's insurance, up to their policy limits
- Once that claim is resolved or their limits are confirmed as insufficient, you notify your own insurer of a potential UIM claim
- Your insurer evaluates the claim much like a liability insurer would, reviewing medical records, damages, and the at-fault driver's payout
- If approved, your insurer pays the difference between your total damages and what the at-fault driver's insurance already covered, subject to your UIM policy limits
Because this process essentially puts you in a negotiation with your own insurance company over money they'd rather not pay, UIM claims can sometimes become more adversarial than people expect from their own carrier.
Why This Coverage Matters More Than People Realize
Many drivers only carry the state-required minimum liability insurance, which in a lot of states may not come close to covering the costs of a serious injury accident. If you're hit by a driver with minimal coverage and you don't have UIM protection yourself, you could be left personally absorbing costs beyond what their policy pays.
This is especially relevant for certain types of accidents where injury severity tends to be higher relative to the vehicles involved, such as motorcycle accidents, where reviewing uninsured motorist coverage for motorcycle claims can highlight just how important this protection can be.
Underinsured Motorist Coverage vs. Uninsured Motorist Coverage
While often bundled together in a policy, these two coverages address different scenarios:
- Uninsured motorist coverage applies when the at-fault driver has no insurance at all, including in many hit-and-run situations
- Underinsured motorist coverage applies when the at-fault driver has insurance, but their policy limits are too low to fully cover your damages
If you were hit by a driver who fled the scene, understanding what to do after a hit-and-run accident can help clarify how uninsured motorist coverage might apply in that specific scenario, since identifying the at-fault driver isn't always possible.
Common Challenges With UIM Claims
Because you're essentially filing a claim against your own insurer for money, a few complications can arise:
- Your insurer may dispute the value of your damages, similar to how a third-party insurer would
- There may be procedural requirements, like needing consent before settling with the at-fault driver, so you don't accidentally waive your UIM rights
- Calculating how insurance adjusters determine settlement value becomes relevant here too, since your own insurer will likely use similar valuation methods
- Policy limits stacking rules, which vary by state and by policy, can affect how much coverage is actually available
Reviewing Your Own Policy Before You Need It
Because underinsured motorist coverage is often optional or available at varying limits, many drivers don't realize how much, or how little, protection they actually have until after an accident. Reviewing your policy's UIM limits, and considering whether to increase them, is a proactive step worth taking well before you ever need to file a claim.
Frequently Asked Questions
Do I have to prove the at-fault driver was underinsured?
Generally yes, this typically involves confirming their policy limits through their insurer or a claims exchange, and demonstrating that your damages exceed what those limits can cover.
Can I use UIM coverage if I was a passenger, not the driver?
In many cases, yes. Passengers are often covered under the vehicle's policy or their own auto policy's UIM coverage, though the specific rules can vary depending on your state and policy language.
Does filing a UIM claim affect my insurance rates?
This can vary by insurer and state. Because you didn't cause the accident, some insurers treat UIM claims differently than at-fault claims, but it's worth asking your insurer or agent directly about your specific policy.
If you've been in an accident with a driver who didn't carry enough insurance, an attorney can help you understand your underinsured motorist coverage and pursue the accident compensation you may be owed.