Surgical Errors and Malpractice in Arizona

By Joe Styler, editor (not an attorney). Updated October 9, 2026. Sources checked

A harmful or disappointing outcome after surgery is not, on its own, proof of malpractice under Arizona law. A claim about an operation has to meet the same two elements as any other Arizona malpractice claim, and it runs through the same expert and deadline rules. This page explains those elements for surgical care, what Arizona’s malpractice statutes say about consent, and who may be responsible. It cannot tell you whether your surgery meets the test.

A bad result is not the same as a breach of the standard of care

Under A.R.S. 12-561, a medical malpractice action is a claim for injury or death against a licensed health care provider, based on, among other things, alleged negligence, errors or omissions in providing health care. A.R.S. 12-562 allows such an action only on the grounds 12-561 lists.

A.R.S. 12-563 sets out what has to be proved. Both elements are necessary:

1. The provider failed to use the care, skill and learning expected of a reasonable, prudent provider in the same profession or class in Arizona, acting in the same or similar circumstances.
2. That failure was a proximate cause of the injury.

The first element is about the care. The second is about cause. A complication can follow surgery without either element being met. A lapse in care can also happen without causing the injury the patient is concerned about. A claim needs both.

How the two elements apply to an operation

Questions about the first element can come up at different points: before the operation, during it, or in the care that followed. At each point the statute applies the same comparison: what a reasonable, prudent provider in the same profession or class would have done in the same or similar circumstances, and whether this provider fell short of it.

The second element, proximate cause, asks whether that shortfall caused the injury. After surgery, this can be hard to separate. Some problems may come from the condition that led to the operation. Others may trace to a specific act or omission. Sorting one from the other takes medical judgment as well as legal analysis, which is why Arizona’s expert rules (below) matter in surgical cases.

Retained objects and wrong-site surgery

People often ask about an item left inside the body after an operation, or an operation done on the wrong part of the body. Arizona’s statutes do not set a separate rule for these in the sections we read. A claim about either one is still measured against the two elements in 12-563, and the certification rule in 12-2603 still asks whether expert testimony is needed. How they apply to particular facts is for a lawyer.

Consent and Arizona’s malpractice statutes

Consent questions come up often with surgery. Two parts of Arizona’s malpractice statutes speak to them.

First, the definition of a medical malpractice action in A.R.S. 12-561 includes a claim based on health care given “without express or implied consent.” Second, A.R.S. 12-562 says a medical malpractice action against a licensed health care provider “shall not be based upon assault and battery.” Read together, they mean a complaint that a licensed provider operated without consent falls within the malpractice definition, rather than being brought as a separate assault and battery claim.

The sections we read do not spell out what a consent discussion must cover, or how a court decides whether consent was enough. We do not describe a test here. If consent is part of your concern, raise it with a lawyer and keep any forms you signed.

One related rule: a malpractice action based on breach of contract for professional services cannot be brought unless the contract is in writing (A.R.S. 12-562).

Who may be responsible after surgery

Under A.R.S. 12-561, a licensed health care provider can be a person, corporation or institution licensed or certified by the state to provide health care. The term includes its officers, employees and agents working under its supervision.

When several people or organizations may share fault, Arizona’s general rule is several liability: each defendant pays only the share of damages matching its percentage of fault (A.R.S. 12-2506). One exception matters in hospitals and practices. A party is responsible for the fault of another person who was acting as its agent or servant. Whether that applies depends on the working relationship, which a lawyer can look at.

Students in teaching settings

In teaching settings, A.R.S. 12-564 applies. Under it, a student in an accredited or state-approved program who gives care under a licensed provider’s supervision is not liable in a malpractice action unless gross negligence is established by clear and convincing evidence. The same statute says this does not eliminate any responsibility of the supervising licensed provider for the student’s actions.

If your concern is a medication given around the time of an operation, our page on medication errors and prescribing mistakes in Arizona covers that topic. If a complication after surgery was not recognized in time, our page on misdiagnosis and delayed diagnosis in Arizona looks at how the two elements apply to a missed or late diagnosis.

The expert affidavit in surgical cases

Arizona builds an early expert step into these claims. Under A.R.S. 12-2603, the person bringing a claim against a health care professional must certify whether expert testimony is needed to prove the standard of care or liability. If it is, a preliminary expert opinion affidavit has to be served with the initial disclosures, and the court shall dismiss the claim against that professional without prejudice if a required affidavit is not filed and served. A.R.S. 12-2604 then limits who may testify about the standard of care, including a same-specialty rule that applies when the defendant is or claims to be a specialist.

One point causes confusion in hospital cases. When the defendant is a health care institution that employs the health professional, 12-2604 applies its expert rules as if the employed professional were the defendant. That rule is about who may testify, not who pays. Our page on the expert affidavit requirement covers both statutes in detail.

Have questions about an operation you or a family member had? Request a free case review.

Deadlines after surgery

The general deadline is in A.R.S. 12-542: two years after the cause of action accrues, which is not necessarily the date of the operation. In Walk v. Ring (2002), the Arizona Supreme Court said a medical malpractice claim accrues when a reasonable person would be on notice to investigate whether the injury came from someone’s wrongdoing. A bad result alone is not always enough, and the date is generally a question for the jury. Do not read that as a later start date for you.

If the patient died, the two years under 12-542 run from the death. Care from a public entity, public school or public employee brings a notice of claim due within 180 days after the cause of action accrues (A.R.S. 12-821.01), and a lawsuit against a public entity or public employee must be brought within one year (A.R.S. 12-821). Federal facilities follow different rules not covered here, so ask a lawyer soon. Our page on the Arizona medical malpractice statute of limitations lays these clocks out together. Sending our form does not stop or pause any deadline.

What to write down

Judging the care is not your job. It helps to note:

• the date of the operation, and of each visit before and after it
• what you were told before surgery about the plan and its risks, and any forms you signed
• what went wrong, when you first noticed it, and what you were told about it
• any later procedures or treatment needed because of the problem
• whether the hospital or surgery center might be run by a public body or the federal government

Records from the surgery and the follow-up care will fill in much of the rest. Our guide to requesting medical records in Arizona walks through that step. For how these rules fit with the rest of Arizona’s malpractice law, see Arizona medical malpractice law explained.

Frequently asked questions

Is a bad outcome after surgery malpractice in Arizona?

Not by itself. A.R.S. 12-563 requires proof of two elements: a failure to use the care, skill and learning expected of a reasonable, prudent provider in the same profession or class in Arizona, and that this failure was a proximate cause of the injury. A complication alone proves neither.

Is there a special rule for a retained object or wrong-site surgery?

Arizona’s statutes do not set a separate rule for these in the sections we read. A claim about either one is still measured against the two elements in A.R.S. 12-563, and the expert certification rule in A.R.S. 12-2603 still applies. A lawyer can explain how these rules fit a given set of facts.

What if I did not consent to part of the surgery?

Arizona’s definition of a medical malpractice action includes a claim based on care given without express or implied consent (A.R.S. 12-561). A.R.S. 12-562 says a malpractice action against a licensed health care provider shall not be based upon assault and battery. The statutes we read do not set out a consent test, so ask a lawyer about your facts.

Can a hospital be responsible for a staff member’s mistake?

Arizona generally uses several liability, so each defendant pays its own share of fault under A.R.S. 12-2506. One exception: a party is responsible for the fault of another person acting as its agent or servant. Whether that applies depends on the relationship.

How long do I have after surgery?

A.R.S. 12-542 generally allows two years after the cause of action accrues, which is not necessarily the date of the operation. Claims against a public entity or public employee need a notice of claim within 180 days and a lawsuit within one year. Sending our form does not stop or pause any deadline.