Emergency Room Malpractice in Arizona: When a Higher Standard of Proof Applies

By Joe Styler, editor (not an attorney). Updated October 8, 2026. Sources checked

If you or a family member was hurt after a visit to an Arizona emergency room, the law may treat that visit differently from an ordinary doctor’s appointment. Arizona has a statute that raises the standard of proof for some emergency care. Separately, a federal law sets duties for hospital emergency departments and lets people harmed by a violation sue the hospital. This page explains both layers. It cannot tell you which one applies to your visit.

Two different sets of rules can touch an ER visit

An ER visit can involve two separate legal routes:

• An Arizona medical malpractice claim. This is the usual claim against a health care provider for care that fell below the expected standard. For some emergency care, Arizona law (A.R.S. 12-572) raises the proof needed for this claim.
• A claim under the federal emergency treatment law. This federal law, often called EMTALA (42 U.S.C. 1395dd), puts specific duties on hospitals with emergency departments. A person harmed by a violation of those duties can sue the hospital under the federal law itself.

These are different claims with different rules and deadlines. We have not checked whether the 12-572 standard also affects a claim under the federal law. That is another question for a lawyer, as is which route fits a particular visit.

What the federal law requires of hospital emergency departments

The federal emergency treatment law applies to hospitals that have an emergency department and take part in Medicare. Under 42 U.S.C. 1395dd, those hospitals must:

• Screen. Give an appropriate medical screening examination, within the capability of the emergency department, to anyone who comes to the emergency department when a request is made for examination or treatment of a medical condition, whether or not they have Medicare.
• Stabilize or transfer appropriately. If the hospital determines that the person has an emergency medical condition, the hospital must provide treatment to stabilize it, within the staff and facilities available at the hospital, or arrange an appropriate transfer to another facility.
• Not transfer an unstable patient except under set conditions. A patient whose emergency condition has not been stabilized may be transferred only when specific conditions in the statute are met.
• Not delay care to ask about payment. The hospital may not delay the screening exam or needed treatment in order to ask about the person’s method of payment or insurance status.

The same statute lets a person who suffers personal harm as a direct result of a hospital’s violation bring a civil action against the hospital. This federal suit is against the hospital, not individual doctors. The damages available are those available for personal injury under state law. The federal law also has separate penalty provisions, which this page does not cover.

These duties are not a general rule that every emergency room mistake breaks federal law.

How Arizona raises the bar for some emergency care

A.R.S. 12-572 covers health professionals who provide care, or are consulted about care, for a patient of a licensed hospital in compliance with the federal emergency treatment law or as a result of a disaster. It says they are not liable for damages from any act or omission unless the elements of a malpractice claim are proved by clear and convincing evidence.

The statute applies the same rule to the hospital itself and to its agents and employees in those cases.

In plain terms, “clear and convincing evidence” is a higher bar than the usual civil standard. The statute does not put a number on that, and neither do we.

Two limits on what we can say. The statute defines “health professionals” by pointing to another statute (A.R.S. 32-3201), which lists licensing chapters rather than job titles, so we do not list who is covered. And it applies to care given “in compliance with” the federal emergency treatment law; we have not checked how Arizona courts decide which care counts. Do not assume every ER visit falls under 12-572, or that yours does not.

The two things that still have to be proved

The higher standard does not create new elements. It raises the proof needed for the same two elements that apply to Arizona malpractice claims about the standard of care under A.R.S. 12-563:

• The provider failed to use the degree of 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.
• That failure was a proximate cause of the injury.

For the general rules, see our guide to Arizona medical malpractice law. If a condition was missed or found late, see our page on misdiagnosis and delayed diagnosis in Arizona.

Deadlines for ER claims

Each route has its own clock.

Arizona malpractice claims: generally two years

A.R.S. 12-542 says an action for injury to a person, including medical malpractice, must be started within two years after the cause of action accrues. For a wrongful death claim, the same statute starts the two years at the death.

Working out when the clock started can be complicated. Arizona courts have said that a malpractice claim does not always accrue the moment a patient knows about an injury, and that when a claim accrued is often a question for a jury. Arizona also has a tolling statute (A.R.S. 12-502) for minors and people of unsound mind, for the claims it covers. If the patient was a child, check the deadline with a lawyer. Our page on the Arizona medical malpractice statute of limitations goes into more detail.

The federal route: two years from the violation

A civil action under the federal emergency treatment law must be brought within two years of the date of the violation (42 U.S.C. 1395dd(d)(2)(C)). The Arizona clock runs from when the claim accrues.

Public entities: much shorter Arizona deadlines

For Arizona claims against a public entity or a public employee, state law sets much shorter deadlines. A.R.S. 12-821.01 requires a notice of claim within 180 days after the cause of action accrues, stating the facts and a specific amount the claim can be settled for. A claim not filed in time is barred. A.R.S. 12-821 says the lawsuit itself must be brought within one year after the cause of action accrues. For a minor, the notice deadline is 180 days after the disability ends. We have not checked how these rules apply to a claim under the federal law. It is not always obvious whether a hospital is run by a public body, so ask about this early.

Sending our form does not stop or pause any deadline. We cannot tell you how much time you have. A lawyer can look at your dates.

Questions about the dates of your ER visit? Request a free case review.

What this means for the expert affidavit

Arizona malpractice claims against a health care professional come with an early expert requirement under A.R.S. 12-2603. The person bringing the claim must file a statement saying whether expert testimony is needed to prove the standard of care or liability. If it is, they must serve a preliminary expert opinion affidavit with their initial disclosures, stating among other things the acts, errors or omissions the expert believes breached the standard of care. If a required affidavit is not filed and served, the court must dismiss the claim against that professional without prejudice.

Neither 12-2603 nor 12-572 mentions the other. 12-572 changes how strongly a claim must be proved where it applies; it does not say anything about the affidavit. Our page on the expert affidavit in Arizona medical malpractice cases explains the requirement in more detail.

What to write down about the visit

You may want to write down:

• Times. Arrival, when you were first seen, when tests were done, and when you were discharged, admitted or transferred.
• Who saw you. Names or roles of the people who treated you, if you know them.
• What was said. What you told staff about your symptoms, and what they told you about results and next steps.
• Payment and transfers. Any talk of payment or insurance and when it came up, and any transfer to another facility.
• What happened after. Follow-up visits, return trips, and when you first learned something may have gone wrong.

Keep your discharge papers, instructions, bills and insurance statements, and date your notes. This is not legal advice, just a way to have the facts ready if you speak with a lawyer.

Common questions

Is every emergency room malpractice claim in Arizona held to the higher standard?

Not necessarily. A.R.S. 12-572 applies to care of a licensed hospital’s patient given in compliance with the federal emergency treatment law or as a result of a disaster. Whether a particular visit falls within that is a question for a lawyer.

Can I sue a hospital under the federal emergency treatment law?

The federal law lets a person who suffers personal harm as a direct result of a hospital’s violation bring a civil action against the hospital, for the damages available under state personal injury law. Whether a violation happened in a given visit depends on the facts.

How long is the deadline for an ER claim?

For an Arizona malpractice claim, A.R.S. 12-542 generally sets two years after the cause of action accrues. For a claim under the federal law, the statute sets two years from the violation. Arizona claims against a public entity or public employee have much shorter deadlines. Exceptions can apply, sending our form does not stop or pause any deadline, and a lawyer can look at your dates.