Arizona Workers' Compensation

A workers' comp claim doesn't end once an injury is accepted — insurance carriers can still dispute which diagnosis is correct, whether your condition is actually connected to your job, or whether a specific treatment is medically necessary.

Medical Disputes in an Arizona Workers' Comp Claim

Each of those disagreements leaves a paper trail. The carrier states its position on a Notice of Claim Status, and if you disagree, Arizona law gives you a limited window to force the issue in front of the Industrial Commission of Arizona. Miss that window, and the carrier's version of events generally becomes final. Act within it, and the dispute moves to an Administrative Law Judge who weighs the competing medical opinions and decides.

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You have 90 days from a Notice of Claim Status to request an ICA hearing under A.R.S. § 23-947 — after that, the notice is generally final and binding.

The legal standard at hearing is whether treatment is 'reasonably required' for your injury under A.R.S. § 23-1062(A), not simply whether the carrier agrees with it.

Medical-dispute hearings often take more than one session because both sides' physicians typically need to testify.

Quick answer

Quick Answer

If your Arizona workers' comp carrier disputes your diagnosis, denies that your condition is work-related, or refuses to authorize a specific treatment, that decision is communicated in writing on a Notice of Claim Status, usually ICA Form 104. You have 90 days from the date on that notice to file a Request for Hearing with the Industrial Commission of Arizona under A.R.S. § 23-947. Miss the deadline, and the notice generally becomes final and binding.

Once you file, your case is assigned to the ICA's Administrative Law Judge Division. An initial hearing date is typically set roughly 90 days after the file arrives there, and medical-dispute cases commonly need more than one hearing session so each side's doctors can testify. The ALJ then has 30 days after your case is fully submitted to issue a written decision, under A.R.S. § 23-942.

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Overview

How a Medical Dispute Actually Plays Out

Medical disputes in an Arizona workers' comp claim usually fall into one of three buckets: the carrier disagrees with your diagnosis, the carrier says your condition isn't causally connected to your job, or the carrier accepts the injury but won't authorize a specific treatment as medically necessary. All three get resolved through the same procedural path — a formal notice from the carrier, and if you disagree, a hearing before the Industrial Commission.

The carrier's decision arrives as a Notice of Claim Status, ordinarily on ICA Form 104. A.R.S. § 23-1061(F) requires the carrier to serve this notice on both you and the Commission any time it denies a claim, changes the amount of your compensation, or terminates your benefits — it can't simply stop paying or stop authorizing care without putting that in writing. If the carrier sits on your claim entirely and doesn't issue any notice within 21 days of being told about it, A.R.S. § 23-1061(M) requires it to pay compensation as if the claim had been accepted for that delay period.

For treatment-specific disputes, the statute cited most often is A.R.S. § 23-1062(A), which entitles an injured worker to medical, surgical, and hospital benefits that are 'reasonably required at the time of the injury, and during the period of disability.' Whether a given MRI, surgery, or course of physical therapy meets that standard is exactly what an ALJ is asked to decide when the carrier says no. Carriers frequently support a denial with an independent medical examination — A.R.S. § 23-1026 requires you to attend one if the carrier requests it, and refusing or obstructing the exam can suspend your right to compensation.

If the dispute isn't resolved informally, it goes to a hearing before an ALJ, who acts as the trier of fact when your treating physician and the carrier's examining physician disagree. Arizona case law — the case often cited on this point is Carousel Snack Bar v. Industrial Commission — establishes that weighing conflicting medical opinions is the ALJ's job, not something either side wins simply by asserting its position more forcefully or hiring another expert.

Process

Steps to Take When the Carrier Disputes Your Medical Treatment

Read the Notice of Claim Status closely and note the date on it — that date starts your 90-day clock under A.R.S. § 23-947, regardless of when you actually see the letter or portal message.
File a Request for Hearing with the ICA before that 90-day window closes. A late request generally makes the carrier's notice final and binding, with only narrow exceptions.
If the carrier schedules an independent medical examination, attend it. A.R.S. § 23-1026 makes this mandatory, and skipping or obstructing the exam can suspend your compensation regardless of how strong the rest of your case is.
Get your treating physician's written opinion on causation and medical necessity into the file — this is the evidence that will be weighed against the carrier's IME report at hearing.
Once the Request for Hearing is filed, expect the case to move to the ALJ Division, with an initial hearing typically set roughly 90 days after the file arrives — and expect more than one hearing date, since medical-dispute cases usually require testimony from physicians on both sides.
After the hearing record closes, the ALJ has 30 days to issue a written Findings and Award under A.R.S. § 23-942. If either side disagrees with the outcome, requesting administrative review only requires stating that review is requested, and a decision on that review is due within 60 days under A.R.S. § 23-943.

Benefits and value

What Happens to Your Benefits While the Dispute Is Pending

If the carrier never sends a Notice of Claim Status within 21 days of learning about your claim, A.R.S. § 23-1061(M) requires it to pay compensation as though the claim were accepted for that delay period — silence doesn't work in the carrier's favor.
Any denial, termination, or change in your compensation amount has to be formally served on you and the ICA under A.R.S. § 23-1061(F). If you never received a written notice, the 90-day clock to request a hearing may not have started yet.
The benefits at stake are defined by A.R.S. § 23-1062(A): medical, surgical, and hospital care that's 'reasonably required at the time of the injury, and during the period of disability.' That's the exact language an ALJ applies when deciding whether a denied treatment should have been authorized.
There's no single statutory deadline for the whole dispute from start to finish — only for its individual steps. Between the 90 days to request a hearing, roughly 90 days to get an initial hearing date once the file reaches the ALJ Division, and the likelihood of more than one hearing session for medical testimony, a contested case can realistically take several months to resolve.

Common risks

Where These Cases Go Wrong

Missing the 90-day deadline in A.R.S. § 23-947. Once it passes, the carrier's Notice of Claim Status is generally treated as final and binding, even if the underlying medical decision was questionable.
Skipping a carrier-requested independent medical examination. A.R.S. § 23-1026 makes the exam mandatory, and refusing or obstructing it can suspend your right to compensation — separate from whatever the medical dispute itself is about.
Treating an informal denial as final, or a formal one as informal. Only a notice actually served under A.R.S. § 23-1061(F) — usually on Form 104 — has legal effect, so keep a copy of everything the carrier sends and note the date it arrived.
Underestimating the timeline. Between the hearing request, the wait for an ALJ Division hearing date, and the likelihood of more than one hearing session for physician testimony, a medical dispute is rarely resolved in a matter of weeks.
Assuming your own doctor automatically wins. The ALJ weighs both sides' medical opinions and decides which is more persuasive — a well-documented record matters more than which physician happens to be treating you.

Why legal help matters

Why Legal Help Often Matters Here

Medical disputes are fundamentally evidence fights: your treating physician's opinion against the carrier's independent medical examiner, presented to an ALJ who has to decide which one is more credible. The 90-day hearing request deadline under A.R.S. § 23-947 is strict, and the hearing process itself involves formal testimony and cross-examination of medical experts — procedures most injured workers have never dealt with before.

This platform is an independent educational and referral resource, not a law firm, medical provider, or government agency, and nothing here substitutes for advice about your specific claim. If your claim involves a denied diagnosis, a causation dispute, or a treatment denial you plan to challenge, connecting with a workers' compensation attorney before your Request for Hearing deadline gives you more room to build your medical record and prepare for what's typically a multi-step hearing process.

FAQ

Frequently Asked Questions

What is a Notice of Claim Status?

It's the written notice an Arizona workers' comp carrier must send — usually on ICA Form 104 — any time it denies your claim, changes your compensation amount, or terminates your benefits, as required by A.R.S. § 23-1061(F). This notice is also what starts your 90-day deadline to request a hearing if you disagree with it.

How long do I have to dispute a denied treatment or diagnosis?

Generally 90 days from the date of the Notice of Claim Status, under A.R.S. § 23-947. You do this by filing a Request for Hearing with the Industrial Commission of Arizona. After 90 days, the notice is typically treated as final and binding except in narrow circumstances.

Do I have to attend an independent medical examination requested by the insurance company?

Yes. A.R.S. § 23-1026 requires an injured worker to submit to a medical examination when the carrier requests one. Refusing or obstructing the exam can suspend your right to compensation, separate from how the underlying medical dispute is eventually decided.

How long does it take to resolve a medical dispute through a hearing?

There's no single fixed timeline, but the individual stages do have deadlines: 90 days for you to request a hearing, roughly 90 days after that for an initial hearing date once the file reaches the ALJ Division, and 30 days for the ALJ to issue a decision once your case is fully submitted, under A.R.S. § 23-942. Because medical-dispute cases commonly need more than one hearing session for physician testimony, the realistic timeline from notice to decision is usually measured in months rather than weeks.

What happens if the insurance carrier never responds to my claim?

If the carrier doesn't issue a Notice of Claim Status within 21 days of being notified of your claim, A.R.S. § 23-1061(M) requires it to pay compensation as if your claim had been accepted for that delay period.

Can I get a second opinion if I disagree with my treating doctor?

Arizona's workers' comp system does have a process for requesting a change of physician or second opinion in certain situations — see our guide on second opinions for how that works and when it applies. In a medical dispute specifically, though, it's usually your treating physician's opinion versus the carrier's independent medical examiner that the ALJ weighs at hearing.

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