If you discover that a medical mistake may have caused an injury, knowing how long you have to act can be critical. Illinois uses two deadlines for medical malpractice claims. The key difference is when each deadline begins.
When does the statute of limitations start?
Illinois generally gives you two years to file a medical malpractice lawsuit after you knew or reasonably should have known about the injury and that it may have been wrongfully caused. This discovery rule matters when you do not immediately realize that treatment caused a problem.
When does the statute of repose apply?
The statute of repose starts from a different date. In most cases, you cannot bring a medical malpractice action more than four years after the medical act or omission — what the provider did or failed to do — that caused the injury. This deadline can expire before you discover the problem.
Which exceptions can change the deadline?
Some circumstances may change these timelines:
- If you were under 18 when the claim arose, Illinois generally allows eight years after the medical act or omission or until your 22nd birthday, whichever occurs first.
- If you had a qualifying legal disability, it may delay or pause the two-year limitations period.
- If a provider fraudulently concealed the basis for your claim, you generally have five years after discovering it to file a lawsuit.
- If your claim involves certain state-run facilities, you may need to provide Court of Claims notice within one year unless you file within that year. Patient care claims against local public entities generally use a two-year discovery period and four-year outer limit.
- If malpractice causes a death, you generally have two years from when you knew or reasonably should have known of the death and its wrongful cause, subject to the four-year repose period.
The applicable deadline therefore depends on both the timing and circumstances of your claim.
Understanding which deadline applies
The date you discovered an injury may differ from when the medical act or omission occurred. Identifying those dates early can help you understand how much time may remain and whether an exception could affect your claim. Legal guidance can help clarify which rules apply to your circumstances.