Medical Malpractice Statute of Limitations in California (2026)

If you’ve been searching for the medical malpractice statute of limitations California applies to your case, you’re not alone. California is one of the most-searched states for this exact question, and there’s a good reason: the deadline isn’t a single, clean number. It’s a two-part test, and missing either part can end a valid claim before it ever reaches a courtroom.

Most states give you a fixed window — two years, three years — measured from one clear starting point. California works differently. Its rule runs two clocks at once and forces you to file by whichever one expires first. Layer on a separate 90-day notice requirement and a short list of exceptions, and you have a deadline that trips up patients and even some out-of-state attorneys. Here’s how the rule actually works.

California’s two-part rule (MICRA)

California’s medical malpractice deadline lives in Cal. Civ. Proc. Code § 340.5, part of the Medical Injury Compensation Reform Act, better known as MICRA. The statute sets two separate limits, and your claim has to clear both.

The rule reads like this: you must file within 1 year from the date you discovered (or reasonably should have discovered) the injury, OR within 3 years from the date of the injury itself — whichever occurs first.

That last phrase is the whole game. The one-year discovery clock and the three-year outer limit (often called a statute of repose) don’t stack. They compete. The earlier of the two deadlines is your real deadline. Our verified data for California confirms the structure: a 3-year outer limit, a 1-year discovery period, and a 3-year repose cap.

So in practice:

• The 1-year clock starts when you knew or should have known you were harmed by negligent care. This protects patients whose injuries surface long after a procedure.
• The 3-year clock starts on the date the malpractice happened, regardless of when you found out. This is a hard ceiling that caps how long the discovery rule can extend things.

A short detour worth understanding before the example: the discovery rule isn’t unique to malpractice. We break down how courts decide when a person “should have known” in our guide to the discovery rule. California’s version is just unusually strict because the competing three-year cap can shut the door early.

What “whichever comes first” means in practice

The “whichever comes first” language is easiest to see with a worked example.

Say a surgeon makes an error during an operation on March 1, 2024. Two scenarios:

Scenario A — early discovery. The patient develops symptoms and learns the surgery caused the harm on June 1, 2024. The one-year discovery clock starts then and runs to June 1, 2025. The three-year clock runs to March 1, 2027. The earlier deadline wins, so the patient must file by June 1, 2025.

Scenario B — late discovery. The same error stays hidden. The patient doesn’t connect the symptoms to the surgery until February 1, 2027 — nearly three years later. The one-year clock would run to February 1, 2028. But the three-year cap expires on March 1, 2027. The earlier deadline wins again, so the patient has only about a month to file, despite just discovering the harm.

Scenario B is exactly why California’s rule catches people off guard. Late discovery doesn’t buy you a fresh year if the three-year ceiling is closing in. The cap is firm unless one of the statutory exceptions applies.

The 90-day notice requirement

Before you can even file a malpractice lawsuit in California, there’s an extra step many people miss. Under Cal. Civ. Proc. Code § 364, a plaintiff must give the healthcare provider at least 90 days’ written notice of the intent to sue before filing the complaint.

The notice has to describe the legal basis of the claim and the type of loss involved. You don’t file the lawsuit during those 90 days — you wait.

Here’s the part that matters for your deadline. If you serve that 90-day notice during the last 90 days of your limitations period, § 364 extends your filing deadline by 90 days from the date of the notice. In other words, the notice requirement can actually buy a little time when you’re close to the wire — but only if you serve it in that final window. Serve it earlier and you don’t get the extension; you just have to wait out the 90 days and then file before your normal deadline.

This is a procedural trap and a procedural cushion at the same time, which is why timing the notice correctly is so important.

Exceptions: fraud, foreign objects, and minors

Section 340.5 spells out a few situations that can pause or extend the three-year outer limit. The statute lists three exceptions to the three-year cap:

• Fraud — when the provider commits fraud related to the injury.
• Intentional concealment — when the provider hides the error or the facts behind it.
• A foreign object — when a non-therapeutic object (like a surgical sponge or instrument) is left in the body. The clock generally runs from when the object is or should have been discovered.

In these situations, the three-year ceiling doesn’t slam shut the way it normally would, because the patient was kept from learning the truth on a normal timeline.

Minors get special treatment too. As a general framework, California provides longer windows for children, and the rule for very young children is notably different: for a child under the age of 6, the deadline is typically extended to 3 years from the injury or until the child’s 8th birthday, whichever is longer. These minor provisions have their own nuances, so treat the specifics as something to verify for your situation rather than a fixed promise. We cover the broader landscape of how deadlines work for kids in our child injury statute of limitations guide.

If you want to understand the mechanics of how a deadline gets paused or extended more generally, our tolling explainer walks through how these pauses work across claim types.

Common mistakes that blow the California deadline

Most missed malpractice deadlines in California come from a handful of avoidable misunderstandings:

• Assuming you have a full year from discovery. The one-year discovery clock is real, but the three-year cap can override it. If you discover the harm late, you may have far less than a year — sometimes only days.
• Treating the 90-day notice as optional or filing during it. Skipping the § 364 notice can get a complaint dismissed; filing the lawsuit inside the 90-day window instead of waiting can do the same. The notice is a prerequisite, not a formality.
• Confusing the injury date with the treatment date. The three-year clock runs from when the negligent act caused harm, which is not always the date of the appointment or procedure. Pinning the wrong start date can make a timely claim look late — or a late claim look timely.
• Waiting to gather “perfect” evidence. Malpractice cases require expert review, and that takes time. Counting on the last week before the deadline rarely leaves room to prepare a credible claim.

When two clocks run at once, the conservative approach is to treat the earlier possible deadline as the real one and work backward from there.

MICRA caps more than the deadline

It’s worth knowing that MICRA does more than set the filing window. The same body of law also limits certain damages in California medical malpractice cases — most notably non-economic damages such as pain and suffering. Those caps have changed over time and are separate from the statute of limitations, so they don’t affect when you must file. But they shape what a claim is ultimately worth, which is one more reason patients consult a California malpractice attorney early rather than trying to evaluate a case alone.

How this compares to other states

California’s two-clock structure is on the stricter end. Many states give a flat two-year window with a more forgiving discovery rule, and some attach much longer outer limits — repose periods of six, seven, or even ten years. California’s three-year cap is comparatively short, especially for injuries that take years to surface.

To see how your state stacks up, our medical malpractice statute of limitations by state guide lays out every state’s deadline, discovery rule, and repose period side by side. If you’re dealing with a California case specifically, the California medical malpractice page has the state-specific breakdown.

Frequently Asked Questions

What is the medical malpractice statute of limitations in California?

Under Cal. Civ. Proc. Code § 340.5, you must file within 1 year of discovering the injury or 3 years from the date the injury occurred, whichever comes first. Both limits apply, and the earlier one controls.

Does the 90-day notice extend my deadline?

It can. If you serve the required § 364 notice of intent to sue during the last 90 days of your limitations period, your deadline is extended 90 days from the date of that notice. Served earlier, it provides no extension — you simply wait out the 90 days before filing.

What happens if I discover the injury years later?

The one-year discovery clock starts when you discover the harm, but it can’t push you past the three-year outer limit unless an exception like fraud, intentional concealment, or a foreign object applies. Late discovery near the three-year mark can leave very little time to file.

Are the rules different for children?

Yes. California generally extends deadlines for minors, and children under 6 typically get until 3 years from the injury or their 8th birthday, whichever is longer. The exact rule depends on the child’s age and circumstances, so verify the specifics for your case.

Check your California deadline

Because two clocks run at once, the safest move is to map out both dates as soon as you suspect malpractice. You can do that in seconds with our statute of limitations calculator, pre-filled for California and medical malpractice, to see your discovery deadline and your three-year outer limit at a glance.

This article is general information, not legal advice. Deadlines turn on specific facts, so confirm yours with a California attorney before relying on any date.