ARIZONA AUTHORITY LIBRARY
Arizona Crash & Auto Insurance Case Authority Library
A research map of leading Arizona appellate decisions governing negligence, comparative fault, automobile insurance, UM/UIM coverage, policy interpretation, insurance bad faith, MedPay, wrongful death, settlements, releases and vehicle product-liability claims.
How to use this authority library
This page is a starting point for Arizona crash-law research. It is organized by doctrine rather than alphabetically so a reader can move from a legal issue to the cases that define the controlling rule.
Find the doctrine
Begin with the issue involved in the crash: fault, coverage, damages, settlement, wrongful death, insurer conduct or another recurring Arizona question.
Read the actual opinion
A case summary identifies the rule. The full opinion establishes the facts, limits, procedural posture and language that actually controls.
Check current statutes
A later statute can change the practical effect of an older case. Always compare case authority to the current Arizona Revised Statutes.
Current Arizona developments: 2023–2026
Arizona’s Supreme Court has recently issued several decisions of direct importance to automobile coverage and crash litigation. These decisions should be checked first when researching the subjects they address.
Interprets Arizona’s UM/UIM anti-stacking statute and the phrase “purchased by one insured.” Multiple named insureds who jointly procure policies may constitute the statutory “one insured” for purposes of a compliant anti-stacking limitation.
Reaffirms that an Arizona strict-products-liability plaintiff must establish both a defect and that the defect made the product unreasonably dangerous. The risk-benefit analysis examines the product as actually designed rather than simply comparing it with a proposed safer alternative.
Holds that Arizona’s UM/UIM Act does not require UIM coverage for an off-road ATV accident occurring off public roads. An insurer may define the policy to exclude that risk.
Holds that a single policy insuring multiple vehicles provides separate UIM coverages for purposes of Arizona’s stacking statute. An insurer seeking to prohibit stacking must use the method authorized by A.R.S. § 20-259.01(H).
Negligence, duty and allocation of fault
A foundational modern Arizona negligence decision. Duty is a legal question for the court and is distinct from breach and causation. Foreseeability is not used to determine whether a legal duty exists.
Reinforces Arizona’s separation of duty from foreseeability. Arizona generally recognizes duties based on legally recognized relationships or public policy rather than merely because harm was foreseeable.
Confirms the continued viability of Arizona’s family-purpose doctrine and rejects the argument that Arizona’s comparative-fault statutes abolished the doctrine.
Important Arizona negligence and causation authority arising from an alcohol-related motor-vehicle collision. The decision also abolished the former common-law rule of tavern-owner nonliability. Current alcohol-provider liability must also be analyzed under Arizona’s later statutory dram-shop framework.
Uninsured and underinsured motorist coverage
Arizona’s UIM statute did not permit the insurer to reduce UIM coverage by workers’ compensation benefits received by the insured.
Holds that an insured injured by another insured under the same automobile policy could recover applicable UIM benefits, subject to credit for liability benefits recovered under that policy.
Holds that UM/UIM coverage is designed to compensate for bodily injury and does not require payment of punitive damages assessed against the tortfeasor unless the insurer specifically contracted to provide that coverage.
A multi-vehicle policy may contain separate UIM coverages for each insured vehicle, and an insurer seeking to restrict stacking must follow § 20-259.01(H).
Arizona’s statutory UIM mandate does not require coverage for an off-road ATV accident occurring away from a public road.
Current Arizona Supreme Court authority interpreting the anti-stacking language authorized by § 20-259.01(H), including policies jointly procured by named insureds.
Insurance policy interpretation and reasonable expectations
Foundational Arizona authority recognizing that standardized insurance-contract language may, in limited circumstances, yield to objectively reasonable expectations created by the transaction, representations or negotiated agreement.
Synthesizes Arizona’s reasonable-expectations doctrine and identifies the limited circumstances in which even unambiguous standardized insurance language may not be enforced as written.
Insurance bad faith and insurer settlement duties
Seminal Arizona Supreme Court authority recognizing the tort of first-party insurance bad faith when an insurer intentionally denies, fails to process or fails to pay a claim without a reasonable basis.
Explains the insurer’s implied duty of good faith and fair dealing. An insurer must act reasonably, investigate adequately and may not place its own interests above the protection the insured reasonably expected from the insurance relationship.
Holds that breach of an express policy covenant is not necessarily a prerequisite to a tort claim for insurance bad faith. The case arose from State Farm’s handling of an automobile MedPay claim.
Applies Arizona’s equal-consideration rule to an insurer’s handling of settlement opportunities exposing its insured to an excess judgment. A first-party “fairly debatable” instruction does not define the third-party failure-to-settle standard.
Establishes important Arizona rules permitting an insured defended under a reservation of rights to protect against personal exposure through a qualifying settlement without automatically violating the cooperation clause.
Important authority concerning interpretation of a release and the use of extrinsic evidence to determine the meaning the parties intended to give contractual language.
Holds that a third-party bad-faith failure-to-settle action is a tort claim and addresses accrual when the insured is exposed to an excess judgment, adopting the final-judgment rule.
MedPay, subrogation and medical-provider liens
Foundational Arizona authority applying the state’s rule against assignment or subrogation of personal-injury claims to an automobile insurer’s attempt to obtain repayment of medical-payment benefits. A.R.S. § 20-259.01(J) later created a limited statutory MedPay lien for qualifying amounts above $5,000.
Interpreted the former version of A.R.S. § 33-931 and held that MedPay was not within the former statutory “health insurance” exclusion from provider liens.
Wrongful death
Major Arizona Supreme Court authority addressing the nature and interpretation of Arizona’s statutory wrongful-death remedy.
Explains Arizona’s one-action structure: one statutory wrongful-death action and judgment may include the separate damages suffered by multiple statutory beneficiaries.
The statutory plaintiff represents all qualifying beneficiaries and owes fiduciary duties to them in conducting and settling the wrongful-death action.
An individual beneficiary is not automatically entitled to a monetary damages award merely because testimony concerning loss is uncontroverted. The jury retains its statutory role in determining what award is fair and just.
Settlement, releases and multiple tortfeasors
Important Arizona authority concerning whether a personal-injury release encompasses an unknown injury and the intent of the parties when the agreement was made.
Interprets Arizona’s Uniform Contribution Among Tortfeasors Act and addresses the interaction between settlement credits and comparative-fault principles.
Vehicle defects and crash product liability
The current Arizona Supreme Court framework requires a products plaintiff first to prove that the product was defective and then that the defect rendered the product unreasonably dangerous. A risk-benefit analysis focuses on the risks and benefits of the challenged product as actually designed.
Quick research matrix
| Issue | Start with | Then check |
|---|---|---|
| Basic negligence duty | Gipson v. Kasey | Quiroz v. ALCOA |
| Family vehicle liability | Young v. Beck | A.R.S. § 12-2506 |
| Comparative fault | A.R.S. §§ 12-2505–2506 | Case law applying allocation to the facts |
| UIM stacking | Franklin v. CSAA | Balzan + § 20-259.01(H) |
| UIM offsets | Cundiff | Current § 20-259.01 |
| Same-policy UIM | Taylor v. Travelers | Current policy + § 20-259.01 |
| Policy interpretation | Darner | Gordinier |
| First-party bad faith | Noble | Rawlings and Deese |
| Failure to settle | Clearwater | Taylor v. State Farm |
| Reservation of rights settlement | Morris | Current coverage and procedural law |
| MedPay reimbursement | Druke | A.R.S. § 20-259.01(J) |
| Medical-provider lien | A.R.S. §§ 33-931–33-937 | Do not rely on pre-2023 lien law alone |
| Wrongful death | Wilmot | Begay, Walsh, §§ 12-611–613 |
| Release interpretation | Dansby | Taylor (1993) + release text |
| Multiple tortfeasor settlement | A.R.S. § 12-2504 | Shelby |
| Vehicle design defect | Maywald v. Toyota | Arizona product-liability statutes and evidence |
Research discipline: cases change meaning when statutes change
Arizona crash law is a combination of statutes and judicial decisions. A case may remain valid precedent for one proposition even though a later statute changes the practical outcome on another issue.
Druke + MedPay
Druke remains important to Arizona’s anti-subrogation doctrine, but § 20-259.01(J) later created a specific statutory MedPay lien for qualifying payments above $5,000.
Dignity Health + provider liens
Dignity Health interpreted older § 33-931 language. The Legislature later amended the statute to expressly exclude MedPay, UM, UIM and health-insurance proceeds from the ordinary lien.
Franklin + Balzan
Franklin explains separate UIM coverages within a multi-vehicle policy. Balzan adds current guidance about the statutory anti-stacking mechanism when multiple policies were jointly purchased.
Old design cases + Maywald
Product-liability research involving vehicle safety systems should now begin with the Arizona Supreme Court’s July 2026 Maywald formulation of defect and unreasonable danger.
Bottom line
Arizona crash law cannot be reduced to a single statute or insurance rule. Liability begins with Arizona negligence and comparative-fault principles; insurance disputes require the policy and A.R.S. § 20-259.01; insurer conduct brings Arizona’s bad-faith cases into the analysis; serious injuries can implicate medical liens, wrongful death and settlement law; and some crashes require a separate product-liability investigation. Use this library to identify the governing doctrine, read the controlling opinion, compare it with the current statute, and verify that neither later legislation nor a newer appellate decision has changed the rule.
← Guide 22: Settlement & Release
Public-interest education only. No legal services offered or accepted. No attorney-client relationship created.
Migration source: https://www.victimsguide.com/az-case-authority-library. Verify current Arizona law and official authority before reliance.
VictimsGuide 