Arizona medical malpractice law
Arizona usually gives you two years to file your malpractice claim if you're a patient there. You'll need your age and the injury's discovery date to work out when that clock started.
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Your deadline: 2 years from when you found out
Arizona rules at a glance
Work out your deadline- Filing deadline
- 2 years from when the injury was discovered
- Damage caps
- No cap
- Before you file
- An expert's sign-off on the claim
- Shared fault
- Pure comparative
Full Arizona law guidedeadlines, caps, children, experts and sources
Example: treatment and discovery six months ago
- TreatmentMay 7, 2026
- Likely deadlineMay 7, 2028
- The clock startsWhen you found out, or should have
- Time to start a claim2 yearsMiss it and the claim is usually lost.
- Pain and sufferingNo cap
- All damages togetherNo overall cap
The rules in Arizona
Filing deadline
2 years
Counted from when the injury was discovered. File within 2 years after the claim accrues. Medical malpractice claims accrue when the patient knew or reasonably should have known of the injury and that it was caused by someone's negligence.
Discovery rule
Applies
Yes. Arizona courts apply the discovery rule to medical malpractice claims.
Outer limit
None found
We found no statute of repose for Arizona.
Damage caps
No cap. The Arizona Constitution forbids laws limiting the amount of damages for death or personal injury (Ariz. Const. art. 2, § 31).
No damage caps of any kind in medical malpractice cases; the state constitution prohibits them.
Children
Different clock
The clock does not run while the patient is under 18. A minor then has the same 2 years after turning 18 that an adult would have.
Affidavit of merit
Required
The claimant must certify whether expert testimony is needed and, if so, serve a preliminary expert opinion affidavit with the initial disclosures.
Ariz. Rev. Stat. § 12-2603
Notice before suing
Not required
No pre-suit notice requirement.
Shared fault
Pure comparative
Pure comparative fault: your award is reduced by your share of fault
Experts
Expert evidence
The standard-of-care expert must generally be licensed and specialize in the same specialty as the defendant, and have spent most of the prior year in active practice or teaching in that specialty (Ariz. Rev. Stat. § 12-2604).
Arizona courts struck down an earlier shorter deadline for children (Barrio v. San Manuel Division Hospital, 1984), so the general minority tolling statute applies.
You'll generally need to file your Arizona medical malpractice claim within two years. The clock began once you knew you were injured and that someone's negligence was involved, or reasonably should have known.
The treatment date isn't always the starting point for your deadline. Arizona uses a discovery rule, and its filing clock stays stopped while the injured patient is a minor. If later care revealed the harm, ask an Arizona lawyer early to help you figure out when your clock started.
This page can't give you legal advice. Once an Arizona lawyer reviews your treatment, they can explain how these filing rules affect the deadline for your claim.
When Arizona's filing clock starts
You'll find the general statute of limitations in Arizona Revised Statutes § 12-542(1). You start counting under Arizona's discovery rule when you know about the injury and that someone's negligence was involved (or reasonably should have known those things).
The injury
The clock usually starts on the date of the malpractice or injury.
Discovery
Yes. Arizona courts apply the discovery rule to medical malpractice claims.
2 years
File within 2 years after the claim accrues. Medical malpractice claims accrue when the patient knew or reasonably should have known of the injury and that it was caused by someone's negligence. (Ariz. Rev. Stat. § 12-542(1))
Children
The clock does not run while the patient is under 18. A minor then has the same 2 years after turning 18 that an adult would have.
Discovery is about more than the treatment date
Which dates matter here? Your notes need the treatment date, but also separate entries for when you learned of the injury and when information linked it to negligence. Your filing clock might not start on the day of an appointment.
Recall what you knew. Your first suspicion of malpractice might not be the discovery date, because the rule also asks what you reasonably should have known. A lawyer can use your chart and any explanation of the injury you received later to help figure out the discovery date.
Children have a different starting point
Until the patient turns 18, the filing clock won't run under Arizona Revised Statutes § 12-502. The adult two-year filing period begins when the patient turns 18. Children's earlier, shorter deadline ended when Arizona courts decided Barrio v. San Manuel Division Hospital back in 1984.
The injured child gets this protection for their own claim. That care may give other family members grounds for their own claims, too. If another family member has a claim, ask a lawyer to check its deadline separately rather than using the child's clock.
Arizona does not cap malpractice damages
Laws can't cap damages for death or personal injury because Article 2, § 31 of the Arizona Constitution forbids it. Your Arizona medical malpractice claim has no cap on non-economic damages, either.
| Damages | Limit in Arizona |
|---|---|
| Non-economic (pain and suffering) | No cap. The Arizona Constitution forbids laws limiting the amount of damages for death or personal injury (Ariz. Const. art. 2, § 31). |
You can't count on getting paid. Knowing Arizona doesn't cap damages won't tell you what a particular claim is worth or whether the patient can actually prove the case. Before talking about a possible case value, ask the lawyer to explain the link between the alleged negligence and the harm.
Ask an Arizona lawyer which rules would apply to your claim if you're considering punitive damages or a wrongful death case. You'll still have questions about damages that the Constitution's ban on caps doesn't answer.
What a claim needs before and at filing
You can file an Arizona medical malpractice claim without giving pre-suit notice. You'll still have to certify whether expert testimony is needed for your claim. You'll have to serve a preliminary expert opinion affidavit with your initial disclosures under Arizona Revised Statutes § 12-2603 if your claim needs expert testimony.
| Requirement | The rule |
|---|---|
| Affidavit or certificate of merit | The claimant must certify whether expert testimony is needed and, if so, serve a preliminary expert opinion affidavit with the initial disclosures. |
| Notice before suing | No pre-suit notice requirement. |
| Expert evidence | The standard-of-care expert must generally be licensed and specialize in the same specialty as the defendant, and have spent most of the prior year in active practice or teaching in that specialty (Ariz. Rev. Stat. § 12-2604). |
| Shared fault rule | Pure comparative fault |
The affidavit and the expert's qualifications
Don't confuse the certification with the affidavit you'll need to serve. If your certification says expert testimony is needed, the preliminary affidavit goes with your initial disclosures when you serve them. Ask your lawyer what your claim requires and when you'll need to serve the affidavit.
Arizona Revised Statutes § 12-2604 generally requires a licensed standard-of-care expert who works in the defendant's specialty. You'll also need to check that they've spent most of the prior year actively practicing or teaching in that specialty to qualify. Don't assume someone meets those requirements just because they have a medical background.
Start by discussing the provider's specialty. The proposed expert's title isn't enough; have your lawyer explain how their practice or teaching meets Arizona's requirements.
Shared fault can affect recovery
The rule in Arizona is pure comparative fault. Patients who share fault aren't automatically barred from bringing a claim, but they may recover less. Ask your lawyer what it could mean for your case if the provider argues that something you did contributed to the injury.
Your whole story matters. When you tell the lawyer which instructions you received, point out anything about them that you think is disputed. Your lawyer still needs to assess the facts of your case under Arizona's rule, even though the comparative-fault chart published by Matthiesen, Wickert & Lehrer, S.C. tells you what that rule is.
How a malpractice case usually proceeds
After a consultation, your case may follow this general path toward a possible resolution. That schedule can change. Ask the lawyer what pursuing your claim would take before you decide whether to go ahead.
Review the treatment and deadline
You'll want a written timeline for that first consultation. The lawyer compares your treatment date with what you learned later to work out when Arizona's discovery rule started your filing clock. The lawyer also needs the patient's age if they're a child.
Examine the records and need for medical testimony
Ask whether you'll need expert testimony as you and the lawyer review the chart. You might need a standard-of-care expert. The lawyer should check whether that person meets Arizona's qualifications before using their opinion.
Prepare the complaint and required disclosures
Your lawyer prepares the lawsuit and the expert-testimony certification once you decide to go ahead with the claim. Arizona requires a preliminary expert opinion affidavit with your initial disclosures if the claim needs expert testimony. Ask how the filing plan accounts for those requirements.
Develop the disputed issues
After the lawsuit is filed, each side works out its arguments about the patient's care and injury. Ask whether more records or testimony are needed to address the alleged negligence and any shared-fault argument, and how the lawyer will handle those issues.
Consider settlement or prepare for trial
Your case could end in settlement or reach trial. Have the lawyer explain what's still disputed, along with any settlement proposal. Even when an expert supports your claim, Arizona's lack of damage caps doesn't promise a particular result.
What you can do now
A short timeline comes first. Before deciding for yourself whether the care was negligent, you can ask a lawyer to review it.
- Write when you first learned of the injury next to the treatment date. Record the date of any explanation linking the injury to possible negligence.
- While you're gathering medical records, tell the lawyer which parts of the chart are still missing.
- If the patient is a child, tell the lawyer right away. Whose possible claims does the lawyer plan to review?
- Have the lawyer check for an outer filing limit while working out your deadline. Talk through the expert affidavit while you're still deciding whether to file.
Tell the lawyer what changed for you after the care. What still doesn't make sense to you? You don't have to decide what those changes mean medically or legally for the lawyer to start with your account.
Questions patients ask about Arizona malpractice claims
Sources
- Arizona Revised Statutes § 12-542, Arizona Legislature
- Arizona Revised Statutes § 12-502, Effect of minority, Arizona Legislature
- Arizona Revised Statutes § 12-2603, Preliminary expert opinion testimony, Arizona Legislature
- Arizona Constitution art. 2, § 31, Damages for death or personal injuries, Arizona Legislature
- State Enactments of Selected Medical Liability Reforms (as of 8/27/2026), Medical Professional Liability Association
- Contributory Negligence/Comparative Fault Laws in All 50 States (updated 6/10/2026), Matthiesen, Wickert & Lehrer, S.C.
- Medical Liability/Malpractice Merit Affidavits and Expert Witnesses, National Conference of State Legislatures
Questions about malpractice in Arizona
How long do I have to sue for medical malpractice in Arizona?
Can I sue for medical malpractice 20 years after treatment?
Is it worth suing for medical malpractice in Arizona?
What is the hardest element to prove in a medical malpractice case?
How do I choose a medical malpractice attorney in Arizona?
Do I need an expert affidavit before filing in Arizona?
Can I bring a claim if I was partly at fault?
Other states
- Best Medical Malpractice Lawyers in Alabama (2026)
- Best Medical Malpractice Lawyers in Alaska (2026)
- Best Medical Malpractice Lawyers in Arkansas (2026)
- Best Medical Malpractice Lawyers in California (2026)
- Best Medical Malpractice Lawyers in Colorado (2026)
- Best Medical Malpractice Lawyers in Connecticut (2026)
- Best Medical Malpractice Lawyers in Delaware (2026)
- Best Medical Malpractice Lawyers in District of Columbia (2026)
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