Key Takeaways
- An adult generally has 2 years from when they knew, or reasonably should have known, of the injury, or got written notice of it, whichever is first (735 ILCS 5/13-212(a)).
- The clock starts when you know or should know of the injury and that it was wrongfully caused (Moon v. Rhode, 2016 IL 119572).
- Four years from the treatment is a wall, even if the error could not have been discovered sooner.
- A child has 8 years from the act, but never past their 22nd birthday.
- A hospital run by local government follows the same 2-year and 4-year structure (745 ILCS 10/8-101(b)), not the usual one-year rule.
- A federally funded health center or a VA hospital needs a written claim to the federal agency within 2 years, before any lawsuit.
- The complaint needs a reviewing health professional’s written report attached, so the practical deadline comes earlier (735 ILCS 5/2-622).
The short answer
Most adults in Illinois have two years to sue for medical malpractice, counted from when they knew or reasonably should have known they were injured and that the injury was wrongfully caused, and never more than four years from the treatment itself. Children have eight years from the treatment, cut off at their 22nd birthday.
That is the rule for private doctors, dentists, registered nurses and hospitals. It differs from the ordinary two-year injury deadline in our post on the Illinois car accident statute of limitations, mainly because of the four-year limit. It also changes for public hospitals, federally funded clinics, concealed errors, and patients who cannot legally act for themselves.
When the two-year clock actually starts
Under 735 ILCS 5/13-212(a), the two years run from “the date on which the claimant knew, or through the use of reasonable diligence should have known, or received notice in writing of the existence of the injury or death,” whichever of those dates occurs first. Three parts of that sentence matter.
“Knew” includes knowing the cause was wrongful. In Moon v. Rhode, the Illinois Supreme Court repeated its long-standing reading of this statute: it “starts to run when a person knows or reasonably should know of his injury and also knows or reasonably should know that it was wrongfully caused.” A patient told that a complication is a known risk of the procedure is not automatically on the clock the day the complication appears.
“Should have known” is objective. The statute asks what you would have learned “through the use of reasonable diligence,” so ignoring a later doctor’s warning does not stop the clock.
“Notice in writing” is its own trigger. A letter or record telling you about the injury can start the two years, and the statute uses whichever date comes first.
Because the start date is argued over later, assume the earliest date anyone could point to, such as the day a second doctor said the first one missed something.
The four-year limit does not wait for discovery
The same subsection ends with a hard outer limit: “in no event shall such action be brought more than 4 years after the date on which occurred the act or omission or occurrence alleged in such action to have been the cause of such injury or death.” That is a statute of repose. The court in Moon put the two rules together this way: “within a four-year statute of repose, any claim of malpractice against a physician or hospital must be filed within two years” of discovery.
How the two limits in 735 ILCS 5/13-212(a) interact when discovery comes late. Both bars are measured in years after the treatment.
Take a scan misread at a visit, and a patient who first has reason to suspect it three years later. The two-year clock would run to year five, but the four-year limit ends the claim at year four. The patient has one year, not two, which is why delayed-diagnosis cases are where this bites hardest.
You may read that Illinois gives extra time when a sponge or instrument is left inside a patient. The statute contains no such rule. Section 13-212 names two exceptions only: fraudulent concealment under Section 13-215 and fertility fraud under Section 13-215.1.
Children and patients who cannot act for themselves
For a patient who was under 18 when the claim accrued, Section 13-212(b) allows 8 years from the act or omission, “provided, however, that in no event may the cause of action be brought after the person’s 22nd birthday.”
| Age at the treatment | Latest filing date under 13-212(b) |
|---|---|
| Newborn | 8 years after the act, around the 8th birthday |
| 10 years old | 8 years after the act, around age 18 |
| 16 years old | The 22nd birthday, since the cap arrives before 8 years pass |
Families often expect the ordinary rule in 735 ILCS 5/13-211, which lets a minor sue within two years after turning 18. Malpractice claims against the providers Section 13-212 covers use the eight-year window instead, so a birth injury claim does not wait for adulthood.
For an adult under a legal disability when the claim accrued, the limitation period “does not begin to run until the disability is removed” (13-212(c)). A disability that begins later pauses the period, but subsection (d) keeps the four-year limit in place.
When the provider hid the mistake
Section 13-212 opens with “Except as provided in Section 13-215,” and Section 13-215 is the one route past the four-year limit for most patients. If the person liable “fraudulently conceals the cause of such action,” the claim may be brought “within 5 years after the person entitled to bring the same discovers that he or she has such cause of action, and not afterwards.”
The word that matters is fraudulently. A bad result nobody explained is not the same as a provider hiding what happened. If you believe a record was altered or you were told something false, raise it early, because concealment has to be proved.
Who treated you can change the deadline
Section 13-212 covers any “physician, dentist, registered nurse or hospital duly licensed under the laws of this State.” Three kinds of provider sit under different statutes.
| Who treated you | Deadline | Where the claim goes first |
|---|---|---|
| Private doctor, dentist, registered nurse or licensed hospital | 2 years from discovery, 4-year limit; children 8 years, not past age 22 | Circuit court, with the 2-622 report attached |
| Hospital run by a county or other local government, or its employee | 2 years from discovery, 4-year limit (745 ILCS 10/8-101(b)) | Circuit court |
| Federally funded community health center deemed under the FTCA | Written claim within 2 years after the claim accrues (28 U.S.C. 2401(b)) | U.S. Department of Health and Human Services, before any lawsuit |
| VA hospital or clinic | Written claim within 2 years after the claim accrues | VA Office of General Counsel, before any lawsuit |
Public hospitals
Most claims against Illinois local government must be filed within one year under 745 ILCS 10/8-101(a). Claims “arising out of patient care” are the exception: subsection (b) gives the same two years from discovery and the same four-year limit as a private hospital. That section contains no separate rule for children, so do not assume the eight-year window carries over to a public hospital. Get advice at once.
Federally funded community health centers
Many neighborhood clinics are funded through the federal Health Center Program. HRSA’s Uniform Data System report for Illinois counts 45 program awardees serving 1,450,397 patients in 2025. When HRSA has “deemed” a center, its staff are treated as Public Health Service employees for malpractice purposes, and under 42 U.S.C. 233(a) a claim against the United States is the only remedy.
HRSA’s FTCA guidance is blunt: “the patient cannot sue the health center or the provider directly in state court but must instead name the United States as the defendant in federal district court after following the required administrative tort claim process.” The first step is a written claim, usually Standard Form 95, to the HHS Office of the General Counsel within two years after the claim accrues (28 U.S.C. 2401(b)). If the agency denies it or six months pass, you may sue in federal court, and after a written denial you have six months to do it. HRSA notes the case is heard without a jury.
Check any clinic in HRSA’s FTCA deemed health center search tool before assuming Illinois rules apply.
VA hospitals
Veterans treated at the Edward Hines Jr. VA Hospital in Hines, or at any VA facility, are in the same federal system. The VA’s Office of General Counsel says a claim “must be received by the proper agency within two years of the date the claim accrued.” It also says the FTCA “does not govern acts of non-VA medical facilities, community care providers, or independent contractors,” so VA community care at a private hospital can fall back under the Illinois rules above.
Why your real deadline is months earlier
An Illinois malpractice complaint cannot be filed on its own. Under 735 ILCS 5/2-622, it needs an attached affidavit and a written report from a reviewing health professional who has determined that “there is a reasonable and meritorious cause for the filing of such action.” The reviewer must practice or have taught within the last six years in the same area of medicine, and for most defendants must be a physician licensed to practice medicine in all its branches. A separate report is required for each defendant, and failing to file one is grounds for dismissal.
That review needs complete records, which take time. If the limitation period would expire first, the report may follow within 90 days of filing, and if a provider ignores a records request for 60 days, it is due 90 days after the records arrive. Treat those as emergency exits, not a plan.
If the patient died
The same statute governs. Moon v. Rhode held that in a wrongful death case alleging malpractice, the limitation period “begins to run when a plaintiff knows or reasonably should know of the death and also knows or reasonably should know that it was wrongfully caused,” and that the more specific malpractice statute controls over the Wrongful Death Act’s general deadline. The four-year limit still applies. Our post on whether a medical error can be a wrongful death claim covers who brings the case and what it recovers.
What to do if you are counting months
- Write the dates down now: the treatment, the first symptoms, the first time anyone suggested the care was wrong, and any letter you received about the injury.
- Request complete records from every provider, not only the last one. The 2-622 review cannot start without them.
- Find out who employed each provider. A private practice, a county hospital, a federally funded clinic and a VA facility each point to a different clock.
- Do not wait for treatment to finish. The four-year limit runs regardless.
Frequently Asked Questions
How long do I have to sue for medical malpractice in Illinois?
Generally two years from when you knew or should have known of the injury and that it was wrongfully caused, and never more than four years from the treatment. A child has eight years from the treatment but cannot file after their 22nd birthday. Federal clinics, VA hospitals and concealed errors follow different rules.
Can I claim for medical negligence after 20 years?
In Illinois, almost never. An adult’s claim ends four years after the treatment even if the harm was undiscoverable, and a child’s ends eight years after it or at age 22. The main exception is fraudulent concealment, which allows five years from discovering the claim and requires proof the provider hid it.
When does the clock start for a misdiagnosis?
When you knew or reasonably should have known both that you were harmed and that the harm was wrongfully caused, or when you received written notice of the injury, whichever is first. For a missed diagnosis that is often the day another doctor finds what the first one missed. The four-year limit still runs from the original visit, so late discovery can leave very little time.
Does Illinois give extra time if a surgical object was left inside me?
No. Some states have a special rule for retained objects, but the Illinois statute does not. Section 13-212 names only two exceptions, fraudulent concealment and fertility fraud. A retained object is still governed by the two-year discovery rule and the four-year limit.
Is the deadline different if a county hospital treated me?
Not for an adult. Patient care claims against a local public entity or its employee get the same two years from discovery and four-year limit under 745 ILCS 10/8-101(b), not the one-year rule for most claims against local government. That section has no separate rule for children, so get advice right away for a child.
How long do I have to file against a VA hospital or federally funded clinic?
Two years after the claim accrues, and the first filing is a written administrative claim, not a lawsuit: to the VA’s Office of General Counsel, or to the Department of Health and Human Services for a deemed health center. You can sue in federal court only after a denial or six months without a decision.
Do I need anything before I can file a malpractice lawsuit in Illinois?
Yes. Section 2-622 requires an affidavit and a qualified health professional’s written report finding a reasonable and meritorious cause, attached to the complaint, with a separate report for each defendant. The review needs your complete records, so start well before the deadline.
Talk to an Illinois medical malpractice lawyer
If you are working out which date started your clock, get the records reviewed now.
Lawyer Furqan handles medical malpractice claims for patients across Cook County, including Oak Lawn, Orland Park, Skokie, Niles and the surrounding suburbs. We also take the brain injury, catastrophic injury and wrongful death cases that medical errors can cause.
Call 847-800-8978 or contact us online. The consultation is free, there is nothing upfront, and you owe no attorney’s fee unless we win. In medical malpractice actions, Illinois caps the total contingent fee at 33 1/3 percent of the recovery under 735 ILCS 5/2-1114(a).
Sources and authorities cited
- Code of Civil Procedure: 735 ILCS 5/13-212, 5/13-211, 5/13-215, 5/13-215.1, 5/2-622, 5/2-1114
- Local Governmental and Governmental Employees Tort Immunity Act: 745 ILCS 10/8-101
- Moon v. Rhode, 2016 IL 119572
- Federal Tort Claims Act: 28 U.S.C. 2401(b), 28 U.S.C. 2675(a); 42 U.S.C. 233
- Health Resources and Services Administration: FTCA Frequently Asked Questions, FTCA deemed health center search tool, Illinois Health Center Program UDS data, 2025
- U.S. Department of Veterans Affairs: Claims Under the Federal Tort Claims Act, Edward Hines Jr. VA Hospital
This article is general legal information about Illinois law, not legal advice, and reading it does not create an attorney-client relationship. Deadlines depend on the facts of each case. Talk to a lawyer about yours.
