Arizona Medical Malpractice: what to handle first around review timing, hospital paperwork, and timing

Arizona medical malpractice law is anchored by one of the most significant state constitutional decisions in American tort history: Kenyon v. Hammer, 142 Ariz. 69, 688 P.2d 961 (1984). In Kenyon, the Arizona Supreme Court struck down the legislature's cap on non-economic damages in medical malpractice cases, holding that it violated Article 18, § 6 of the Arizona Constitution — the anti-abrogation clause — which provides that "the right of action to recover damages for injuries shall never be abrogated, and the amount recovered shall not be subject to any statutory limitation." The Kenyon ruling's consequence: Arizona cannot cap non-economic malpractice damages by statute. Unlike Virginia (with its aggregate $2.95M cap increasing annually), California (with its $350K non-economic cap), or Indiana (with its $1.8M total damages cap), Arizona medical malpractice damages are completely uncapped. Arizona juries can and do award multi-million dollar non-economic damage verdicts for catastrophic malpractice — brain damage to a newborn, permanent paralysis from surgical negligence, wrongful death of a young adult — without any statutory ceiling.

Kenyon's influence extends beyond damages: it shapes how the Arizona legislature approaches any tort reform touching medical malpractice, because any cap on damages faces near-certain invalidation under the anti-abrogation clause. Arizona medical malpractice reform debates since 1984 have focused on non-damages areas — certificate of merit requirements, expert witness qualification rules, SOL reform — rather than damage caps that courts would immediately strike down.

Certificate of Merit Requirement: A.R.S. § 12-2603

Arizona requires that a plaintiff filing a medical malpractice lawsuit certify that they have or will obtain an expert medical opinion supporting the case. A.R.S. § 12-2603 requires the plaintiff's attorney (or pro se plaintiff) to certify that the attorney has consulted a qualified expert who has reviewed the facts and concluded that there is reasonable probability that the defendant's conduct fell below the applicable standard of care AND caused the plaintiff's injury. Timing: the certificate of merit must be filed with the complaint. However, if the attorney cannot complete the expert consultation before the statute of limitations requires filing, a certificate of good cause may be filed instead — the attorney must then supplement with the expert certificate within 60 days of filing. The qualification requirements for the expert: the expert must be knowledgeable about the applicable standard of care, have experience treating the type of condition involved, and (if the defendant is a specialist) be in the same specialty or a specialty with similar training. A certificate of merit that names an unqualified expert is the same as no certificate — cases have been dismissed for submitting certificates from non-specialty-matched experts.

Standard of Care and Expert Testimony in Arizona Malpractice

Arizona medical malpractice requires proof of: (1) a physician-patient relationship (duty); (2) the applicable standard of care — what a reasonably competent health care provider in the same specialty would have done in the same or similar circumstances; (3) breach — the defendant's conduct fell below that standard; (4) causation — the breach was a proximate cause of the plaintiff's harm; and (5) damages. Expert testimony is required on standard of care and causation in virtually all Arizona malpractice cases — juries cannot determine from common knowledge whether a surgeon committed malpractice during a laparoscopic cholecystectomy. Arizona courts have addressed the "locality rule" — many states use a national standard of care rather than a local standard, recognizing that physicians at rural Arizona hospitals may lack resources available at Mayo Clinic Arizona in Scottsdale or Banner University Medical Center in Phoenix. Arizona generally applies a national standard for specialist physicians but may apply a modified locality standard for general practitioners in rural communities. Banner Health is the largest health care employer in Arizona, operating 30+ hospitals across the state. Dignity Health Arizona, Valleywise Health (Maricopa County's safety-net system), and multiple specialty hospitals in the Phoenix metro area create a diverse health care landscape with varying resources and standards of care applicable in different facilities.

Arizona's 2-Year Malpractice SOL and Discovery Rule

A.R.S. § 12-542(1) establishes a 2-year statute of limitations for medical malpractice claims. Arizona applies the "discovery rule" to malpractice: the limitations period begins running when the plaintiff knew or, in the exercise of reasonable diligence, should have known of the injury, its cause, and the connection to the medical provider's conduct. This is a significant protection in cases where malpractice is not immediately apparent — a retained surgical sponge discovered two years after surgery; a misread pathology report whose consequences don't manifest for 18 months; a medication error whose long-term effects develop slowly. Arizona courts have addressed when the discovery rule clock starts in cases including Mayer v. Good Samaritan Hosp., 14 Ariz. App. 248, 482 P.2d 497 (1971) and subsequent decisions establishing that the discovery rule tolls the limitations period only while the plaintiff is reasonably unaware of the connection between the medical treatment and the harm — not simply because the plaintiff doesn't know they have a legal claim. Statutes of repose: Arizona does not have a general malpractice statute of repose (unlike Washington's 8-year repose), but specific rules apply to minors (A.R.S. § 12-502 tolls during minority) and to cases involving foreign objects left in the body.