Who Pays Medical Bills During an Injury Case? Illinois

Published: June 20, 2026

In Illinois, the at-fault driver’s insurer does not pay your medical bills as you treat. While your case is pending you cover care through your own MedPay coverage, your health insurance, or a provider letter of protection, and those sources are repaid out of your settlement at the end.

Last Updated: June 19, 2026

After a serious crash the bills start almost immediately: the ambulance, the emergency room, the imaging, the follow-up visits. Your injury case, though, can take many months to resolve. One of the first questions people ask us is simple and urgent: who pays for my treatment right now?

Here is the part most people do not realize. The at-fault driver’s insurance company does not pay your medical bills as you go. In Illinois you generally cover your own care while the claim is pending, using one or more of three sources, and then those sources are repaid out of your settlement at the end. Knowing how each one works, and using them in the right order, protects both your treatment and your final recovery. For the bigger picture, see our guide on who pays medical bills after a car accident in Illinois.

Why the at-fault driver’s insurance will not pay your bills now

The other driver’s liability policy is what the law calls third-party coverage. It is a contract between that driver and that driver’s insurer, not with you. That insurer’s only duty is to defend and, if fault is proven, indemnify its own insured. No Illinois law requires it to advance your medical bills before liability and damages are settled. Fault, causation, and the value of your injuries are all in dispute until the case resolves, so the liability insurer pays nothing toward your care in the meantime. That is exactly why you have to lean on your own resources first.

Source 1: Medical Payments coverage (MedPay) on your own auto policy

MedPay is an optional, no-fault coverage you may already carry on your own car insurance. It pays reasonable and necessary medical expenses from a crash regardless of who was at fault, up to your limit (commonly $1,000 to $25,000). Because it is a direct, no-fault benefit, MedPay money tends to arrive fast, often within days of submitting bills. Our overview of MedPay and UM/UIM coverage in Illinois explains how these first-party coverages fit together.

A few things people do not know about MedPay:

It only pays medical and funeral expenses. MedPay does nothing for lost wages or for pain and suffering. Those are recovered later, from the liability claim or your own underinsured-motorist coverage.
It is often not open until you ask. Many people never realize they have it. We can ask your own carrier to open a MedPay claim and tell you the limit.
Save it for the cookie crumbs. Copays, deductibles, the ambulance ride, the odds and ends your health insurance will not touch. Those small bills get left behind and come back to bite you later, and MedPay is built to absorb them.
It usually gets repaid at the end. If your policy has a subrogation clause (most do), the MedPay insurer is entitled to be reimbursed from your settlement.

Source 2: Your own health insurance

If you have health insurance, private, employer, Medicare, or Medicaid, use it. Your health plan pays your providers at its negotiated rates, which are almost always far lower than the sticker price on a hospital bill. That negotiation is a hidden benefit: it shrinks the amount that ultimately has to be repaid out of your recovery, which can leave more money in your pocket at the end.

The trade-off is reimbursement. Under Illinois law, a health insurer has no automatic right to be repaid from your settlement unless its policy says so, but most modern plans, and nearly all employer ERISA plans, include a subrogation or reimbursement clause. So the plan will assert a claim against your recovery for what it paid. There is a meaningful protection here: an in-network provider that has been paid its contracted rate cannot turn around and bill you, or lien your case, for the difference between that rate and its full charge.

One caution: using your health insurance is usually the right move, but it is not automatic. Because your injury was caused by someone else, a hospital or provider can sometimes choose not to bill your health insurance at all, and instead assert a lien against your future settlement for its full charges, even when you ask it to bill your health plan. Whether a provider does this can depend on your particular health plan. It is one of the things we watch for and push back on, because routing your bills through your health insurance first usually leaves more money in your pocket.

If you are on a Medicaid managed-care plan, the lien is handled differently and tends to surface slowly, so it is worth identifying early. See our guide on how medical liens reduce your net settlement in Illinois.

Source 3: Letters of protection and medical liens

When you do not have enough MedPay or health coverage, many providers, often orthopedic surgeons, pain specialists, and imaging centers, will treat you now and wait to be paid out of your settlement. The instrument is a letter of protection: a written promise, signed by you and your attorney, that the provider will be paid from the proceeds of your case. The provider treats now and secures a lien under the Illinois Health Care Services Lien Act (770 ILCS 23).

That Act also protects you. It caps all health care provider liens together at 40% of your total recovery, and no single category, all physicians together, or all hospitals together, can take more than one-third. If the liens climb to 40% or more, physicians are capped at 20% and hospitals at 20%. In other words, the law guarantees that liens cannot swallow your whole settlement, and a court can sort out and reduce competing liens if it comes to that.

The order, and the part that protects your recovery

In practice we use these sources in order: MedPay first because it is fast and direct, then your health insurance, then letters of protection for treatment the first two cannot cover. At the end of the case, the liens and reimbursement claims are paid out of the settlement, and you receive the net.

One Illinois rule works in your favor through all of this: the collateral source rule. The at-fault driver cannot pay you less just because your own insurance has been covering your bills. The benefit you paid for, your coverage, is not a gift to the person who hurt you. Subrogation and liens then make sure no one is paid twice for the same bill. Part of our job is to negotiate those liens and reimbursement claims down so that as much of the recovery as possible stays with you. In one matter we fought a single medical lien for more than a year to keep over $20,000 in our client’s pocket.

Frequently Asked Questions

Does the at-fault driver’s insurance pay my medical bills as I treat?

No. The at-fault driver’s liability insurance is third-party coverage with no duty to you until the case settles or a judgment is entered. You cover your care in the meantime through MedPay, your health insurance, or a letter of protection, and those sources are repaid from your settlement.

What does MedPay cover, and what does it not cover?

MedPay pays reasonable and necessary medical and funeral expenses from the crash, regardless of fault, up to your limit. It does not pay lost wages or pain and suffering. Use it for copays, deductibles, the ambulance, and bills your health insurance will not cover.

Will I have to pay my health insurance or MedPay back out of my settlement?

Usually yes, if the policy contains a subrogation or reimbursement clause, which most do. The good news is that your health plan’s negotiated rates lower the amount owed, and we work to reduce these claims before you receive your net recovery.

How much of my settlement can medical liens take in Illinois?

Under the Health Care Services Lien Act (770 ILCS 23), all provider liens together cannot exceed 40% of your recovery, and no single category of provider can take more than one-third. A court can adjudicate and reduce competing liens.

What is a letter of protection?

It is a written agreement that lets a provider treat you now and be paid later out of your settlement, secured by a medical lien. It keeps necessary treatment moving when you do not have coverage to pay up front.

Our Peoria personal injury team handles the question of who pays, and protects what you keep at the end, so you can focus on getting better. If you were injured in a crash in the Peoria area, call Parker & Parker at (309) 673-0069 for a free consultation.

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