Arizona demand practice divides into four categories depending on the defendant and claim type: a third-party liability demand, a UM/UIM first-party contract demand, a notice of claim against a public entity or public employee, and a medical negligence preliminary expert opinion affidavit. Missing a statutory deadline or filing a deficient notice can bar the claim.
Four documents arise at the pre-suit or early litigation stage: a third-party liability demand to an insurer, a UM/UIM first-party contract demand, a notice of claim under A.R.S. § 12-821.01, and a preliminary expert opinion affidavit under A.R.S. § 12-2603.
This article covers when each document applies, what a notice of claim must contain, how public-entity service rules operate, and how Arizona limitation periods interact with these requirements and Arizona malpractice deadlines, as of May 2026.
What counts as a demand letter under Arizona law
Arizona PI and medical malpractice matters generate pre-suit documents with different legal functions. A third-party liability demand to an insurer or self-insured defendant presents liability, damages, and a proposed resolution amount under common-law tort principles and Arizona's pure comparative fault scheme under A.R.S. § 12-2505. These demands follow no prescribed statutory form and track general multistate demand requirements rather than an Arizona-specific template.
A statutory notice of claim against a public entity, public school, or public employee is required under A.R.S. § 12-821.01 before suit may proceed. Noncompliance bars the claim entirely. UM/UIM demands are first-party contract demands governed by the insurance policy and A.R.S. § 20-259.01, with bad-faith standards under Zilisch v. State Farm Mut. Auto. Ins. Co., 196 Ariz. 234 (2000).
The § 12-2603 preliminary expert opinion affidavit is different from both forms of demand. It is a post-filing merit certification tied to initial disclosures and is intended to ensure expert-supported standard-of-care and causation theories at the outset of the case.
When an Arizona notice of claim is required instead
A.R.S. § 12-821.01(A) requires a written notice of claim within 180 days after accrual for claims against a public entity, public school, or public employee. A claim not filed within that period is barred, and no action may be maintained.
Under A.R.S. § 12-820, a "public entity" is the state and any political subdivision, and the "State" includes any state agency, board, commission, or department. Political subdivisions include counties, cities, towns, and school districts; county- or municipally operated hospitals may fall within that framework.
Section 12-821.01(B) codifies a discovery standard. Accrual occurs when the damaged party realizes damage and knows or reasonably should know the cause, source, act, event, instrumentality, or condition that caused or contributed to it. Thompson v. Pima County, 226 Ariz. 42 (App. 2010), held that accrual requires only a minimum requisite of knowledge sufficient to identify that a wrong occurred and caused injury.
A companion one-year statute of limitations under A.R.S. § 12-821 applies separately, and both deadlines must be satisfied.
What an Arizona notice of claim must contain
The statute imposes three mandatory elements, and Arizona courts apply strict compliance rather than substantial compliance. The notice must contain facts sufficient to permit the public entity to understand the basis of liability, a specific amount for which the claim can be settled, and facts supporting that amount.
The Arizona Supreme Court in Deer Valley Unified Sch. Dist. v. Houser, 214 Ariz. 293 (2007), held that the statute requires a particular and certain amount of money and that qualifying language fails. The Arizona Supreme Court in Backus v. State, 220 Ariz. 101 (2009), held that a claimant complies by providing the factual foundation the claimant regards as adequate to permit the public entity to evaluate the specific amount claimed.
How the notice of claim interacts with a public entity's insurer
The statute requires filing with the person authorized to accept service for the public entity under the Arizona rules of civil procedure. Service on an insurer, risk pool, or claims administrator does not satisfy the statute. If both the public entity and an individual public employee will be sued, separate notice and service obligations may apply.
Authorized recipients by entity type include the following:
- State agencies: Attorney General
- Counties: Clerk of the Board of Supervisors
- Cities and towns: City or Town Clerk
- School districts and public schools: The person or body authorized to accept service under Arizona Rule of Civil Procedure 4.1(h); for school districts, this is generally the governing board of the district or its authorized service recipient
- Public universities: Arizona Board of Regents
- Individual public employees: The specific public employee if that person is being sued
A claim is deemed denied 60 days after filing under § 12-821.01(E) unless the claimant receives a written denial before that period expires.
Arizona medical malpractice claims and the preliminary expert opinion affidavit
A.R.S. § 12-2603 requires the claimant or attorney to certify whether expert opinion testimony is necessary to prove the standard of care or liability. If expert testimony is required, the claimant must serve a preliminary expert opinion affidavit with the Rule 26.1 disclosures, due 30 days after the first responsive pleading.
The affidavit must establish four elements:
- The expert's qualifications on standard of care or liability
- The factual basis for each claim
- The acts, errors, or omissions violating the applicable standard of care
- How those acts caused or contributed to the claimant's damages
A.R.S. § 12-2604 requires the expert to specialize in the defendant's specialty, hold matching board certification if applicable, and have devoted a majority of professional time in the preceding year to clinical practice or teaching in that specialty. Establishing the affidavit's factual basis depends on thorough clinical record review before the disclosure deadline.
Failure to file the affidavit triggers dismissal without prejudice under § 12-2603(F), as confirmed in Boswell v. Fintelmann, 242 Ariz. 52 (App. 2017). The Arizona Supreme Court in Rasor v. Northwest Hospital, 243 Ariz. 160 (2017), held that the § 12-2603(F) cure provision does not extend to expert qualification deficiencies raised at summary judgment.
Timing the pre-suit demand against Arizona statutes of limitations
Each claim type carries a different limitation period, accrual rule, and pre-suit notice obligation. The 180-day notice deadline under § 12-821.01 runs concurrently with but independently of the two-year PI statute of limitations under A.R.S. § 12-542. Medical negligence claims fall under the same two-year period, consistent with malpractice limitations nationwide.
Dram shop liability and pre-suit statutory requirements
Arizona dram shop liability comes exclusively from A.R.S. § 4-311. The Arizona Supreme Court in Torres v. JAI Dining Services, 256 Ariz. 212 (2023), held that A.R.S. § 4-312(B) abrogated the common-law dram shop action.
Section 4-311(A) requires proof that the licensee sold liquor to a purchaser who was "obviously intoxicated" or underage, the purchaser consumed the liquor, and that consumption proximately caused the injury or death. Demands to licensees typically require transaction records, surveillance footage, and eyewitness testimony of the patron's visible intoxication at sale. The one-year statute of limitations under A.R.S. § 12-541(5) applies.
Common errors that defeat an Arizona demand or notice of claim
Arizona pre-suit defects usually arise from recipient, timing, and content errors rather than from the absence of a conventional demand package. Public-entity claims are the most rigid because § 12-821.01 imposes both a short deadline and strict content requirements.
Common defects include the following:
- Filing a notice of claim with an insurer, risk pool, or claims administrator instead of the authorized statutory recipient
- Using qualifying language such as "approximately," "no less than," or "or more" instead of a single unconditional dollar figure
- Omitting facts supporting the claimed settlement amount
- Applying the ordinary two-year PI limitations clock instead of the § 12-821.01(B) accrual rule
- Filing a § 12-2603 affidavit with an expert who lacks the specialty or board-certification qualifications required by § 12-2604
- Treating a UM/UIM first-party contract demand as interchangeable with a third-party tort demand
Each defect traces back to misclassifying the defendant or the claim type, which controls every downstream deadline, recipient, and content requirement.
Defendant classification determines every pre-suit deadline
Arizona pre-suit practice turns on defendant classification: the defendant and claim type determine the applicable deadline, recipient, and content standard. A 180-day notice of claim governs public entities and employees, a preliminary expert opinion affidavit governs medical negligence claims at the disclosure stage, and ordinary liability and UM/UIM demands follow their own contract and limitations frameworks.
Accurate chronology building, medical records, and limitations tracking remain part of the same documentation framework. Legal AI tools support building case chronologies, organizing medical records, and tracking statutory deadlines tied to case facts.
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