When does Illinois’s two-year medical malpractice discovery period expire?

Confirm a covered licensed defendant and a claim arising out of patient care.

Establish actual knowledge, reasonable-knowledge and written-notice dates, then enter the earliest qualifying date.

Preserve the alleged causative act date and compare the four-year component separately.

1. Confirm a covered licensed defendant and a claim arising out of patient care.
2. Count two calendar years from the earliest of the three qualifying events. This output does not automatically compare the four-year act-based limit or resolve exceptions.
3. Check the final weekend, statutory holiday and the proper court’s actual calendar.
4. Commence the patient-care action within the applicable combined limits. Preserve knowledge, notice and act evidence. Review the Section 2-622 affidavit, certificate and report duties separately.

Section 1.11 excludes a final Saturday, Sunday or statutory holiday and consecutive excluded days. Section 17(a) of the Promissory Note and Bank Holiday Act includes Pulaski Day, Good Friday and the general election for members of the House of Representatives. Check proclamations, the proper court’s actual calendar and clerk access separately. The bundled Illinois calendar covers 2026 and 2027.

Fictitious example

Use the ordinary adult discovery component after comparing all three events. Compare the separate four-year period before treating any date as the claim’s filing boundary. Minor, disability, concealment and fertility-fraud provisions need separate review. Fictitious statutory event, independently established under the precise scope stated in this guide. Use the ordinary adult discovery component after comparing all three events. Compare the separate four-year period before treating any date as the claim’s filing boundary. Minor, disability, concealment and fertility-fraud provisions need separate review.

Fictitious ordinary adult patient-care claim. The earliest notice event and a later four-year boundary are independently established. This computes discovery only, not all commencement limits.

The defendant and patient-care scope matter

Subsection (a) addresses physicians, dentists, registered nurses and hospitals duly licensed in Illinois for injury or death arising out of patient care, whether pleaded in tort, contract or otherwise.

The earliest event controls discovery

Actual knowledge, knowledge attributable through reasonable diligence and written notice are alternatives. The statute selects whichever occurs first, not the most recent communication.

The four-year component must also be checked

The ordinary subsection (a) act-based period runs from the alleged causative act, omission or occurrence. A discovery count alone does not establish that commencement remains available.

Minority and disability are distinct statutory branches

Subsection (b) addresses under-eighteen claims with an eight-year act-based period and twenty-second-birthday qualification. Subsection (c) addresses other disability at accrual. Subsection (d) addresses later disability and does not invalidate repose.

Concealment and fertility fraud are express exceptions

Subsection (a) expressly excepts Sections 13-215 and 13-215.1. The latter’s fertility-fraud periods and alternative triggers require their own classification, not an automatic two-year substitution.

The report deferral does not extend claim commencement

Section 2-622(a)(2) permits the stated ninety-day certificate and report deferral after a qualifying complaint affidavit. It does not automatically extend the malpractice filing limitation.

• This calculation does not determine whether relief is available or whether the facts satisfy the statute.
• A current statutory edition does not establish the law for every historical claim. Preserve the applicable edition and actual orders.

• Confirm a covered licensed defendant and a claim arising out of patient care.
• Establish actual knowledge, reasonable-knowledge and written-notice dates, then enter the earliest qualifying date.
• Preserve the alleged causative act date and compare the four-year component separately.
• Subsection (a) addresses physicians, dentists, registered nurses and hospitals duly licensed in Illinois for injury or death arising out of patient care, whether pleaded in tort, contract or otherwise.
• Actual knowledge, knowledge attributable through reasonable diligence and written notice are alternatives. The statute selects whichever occurs first, not the most recent communication.
• The ordinary subsection (a) act-based period runs from the alleged causative act, omission or occurrence. A discovery count alone does not establish that commencement remains available.
• Subsection (b) addresses under-eighteen claims with an eight-year act-based period and twenty-second-birthday qualification. Subsection (c) addresses other disability at accrual. Subsection (d) addresses later disability and does not invalidate repose.
• Subsection (a) expressly excepts Sections 13-215 and 13-215.1. The latter’s fertility-fraud periods and alternative triggers require their own classification, not an automatic two-year substitution.
• Section 2-622(a)(2) permits the stated ninety-day certificate and report deferral after a qualifying complaint affidavit. It does not automatically extend the malpractice filing limitation.
• Commence the patient-care action within the applicable combined limits. Preserve knowledge, notice and act evidence. Review the Section 2-622 affidavit, certificate and report duties separately. File with the proper clerk in the required format. Rule 9 ordinarily requires civil electronic filing, subject to its exceptions and exemptions. Rule 9(f) ordinarily requires submission before midnight in the court time zone unless a statute, rule or actual order specifies a different time. A submission on a closed clerk day ordinarily receives the next open-day stamp. Preserve the actual electronic file mark, receipt and any filing-relief order. Filing and service are distinct acts.