UM/UIM Arbitration in Illinois: What to Expect

Last Updated: April 2, 2026

UM/UIM arbitration in Illinois is mandatory arbitration to resolve disputes over uninsured/underinsured motorist coverage amounts when the driver’s liability is clear but coverage is disputed. A neutral arbitrator reviews the case and makes a binding decision. Either party can refuse arbitration, triggering a lawsuit.

If you file an uninsured or underinsured motorist claim in Illinois and your insurance company will not pay what your case is worth, the dispute typically goes to arbitration—not court. Most Illinois auto policies require it. This is not a bad thing, but it is different from a lawsuit, and understanding the process can help you prepare and get a fair result.

Why Arbitration Instead of Court?

Almost every Illinois auto insurance policy includes a mandatory arbitration clause for UM/UIM disputes. That means if you and your insurer cannot agree on the value of your injuries, a panel of arbitrators decides—not a judge or jury. This is standard, enforceable, and in many ways can work in your favor.

How the Process Works

Here is what to expect in a typical Illinois UM/UIM arbitration:

Filing the Demand

When negotiations stall, your attorney files a formal demand for arbitration. This puts the insurer on notice that you are proceeding to a hearing and outlines the damages you are claiming.

Picking the Arbitrators

In most cases, a three-person panel decides the case. You pick one arbitrator, the insurer picks one, and those two agree on a neutral third (the “umpire”). All three are typically practicing attorneys with personal injury experience. If the two sides cannot agree on the neutral, a court appoints one.

Exchanging Evidence

Both sides share medical records, bills, accident reports, witness statements, and expert opinions before the hearing. Discovery is more limited than in a full lawsuit, which keeps costs down and speeds up the timeline.

The Hearing

The hearing is structured like a trial: opening statements, witness testimony, cross-examination, exhibits, and closing arguments. The biggest difference is that there is no jury. The arbitrators evaluate the evidence and make the decision. The proceedings are private and not part of the public record.

The Award

After the hearing, the panel issues a written award. A majority vote controls. In most Illinois UM/UIM cases, the award is binding, meaning it can be confirmed by a court and is very difficult to overturn on appeal.

Advantages of Arbitration

Faster: Most cases resolve in 6–12 months from demand to award, compared to 18–36 months for litigation.
Less expensive: Streamlined procedures mean lower legal fees, though you will share in arbitrator costs.
Experienced decision-makers: Arbitrators are attorneys who understand injury law. You do not need to simplify complex medical evidence for a lay jury.
Privacy: The proceedings and the award are confidential.

What to Watch Out For

Arbitration has some real risks:

Limited appeal: If the arbitrators get it wrong, your options are extremely narrow. You generally cannot appeal just because you think the award was too low.
Your insurer will be prepared: The insurance company will have experienced defense attorneys presenting their case. Going in without your own attorney puts you at a significant disadvantage.
Policy deadlines: Some policies impose deadlines for demanding arbitration. Missing them can forfeit your entire claim.

Do You Need a Lawyer?

Technically, no. Practically, yes. Your insurance company will have a lawyer. The arbitrators expect organized, evidence-backed presentations. And the stakes—your medical bills, lost income, and recovery—are too high to leave to chance.

At Parker & Parker, we have handled UM/UIM arbitrations throughout central Illinois for decades. We prepare every case with the same intensity as a jury trial. If you are in a dispute with your insurer over a UM/UIM claim, contact us for a free consultation.

Frequently Asked Questions

How much does arbitration cost?

Arbitrator fees are typically split between both sides. The overall cost is generally lower than a full court case because of streamlined discovery and shorter timelines.

Can I reject the arbitration award and go to court?

In most Illinois UM/UIM policies, arbitration is binding. You cannot reject the award and start over in court. This is why thorough preparation matters.

What if my insurer is acting in bad faith?

If your insurer unreasonably delays or denies your UM/UIM claim, you may have a separate bad faith claim under Illinois law (215 ILCS 5/155). An attorney can advise whether bad faith applies to your situation.

Truck accident cases involve complex regulations and multiple liable parties. Our Parker & Parker personal injury team have the experience to handle these challenging claims.

Need a lawyer? This article is part of our Peoria Uninsured Motorist Lawyer practice area. Call Parker & Parker at 309-673-0069 for a free consultation.