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You’ve been told something went wrong with your care, and now you’re trying to figure out if it counts as medical malpractice. It’s a harder question than it sounds. Winning a claim means proving four separate things, and one of them, causation, trips up more cases than any other. Not because the harm isn’t real, but because a patient has to show exactly how a provider’s mistake led to it, not just that a bad outcome happened along the way.
That’s where a case is usually won or lost, and it’s why the right guidance early on matters so much.
The Kaiser Law Group has spent nearly three decades untangling exactly this kind of case for families across Flagstaff and Northern Arizona, and knows how to build the evidence a claim like this needs.
Ask a handful of experienced Flagstaff medical malpractice attorneys which element is hardest to prove, and most will say causation.
A patient has to connect a provider’s substandard care to a specific additional injury. Not just a bad result. Something a jury can trace back to the breach itself, rather than to the illness that brought the patient in to begin with.
That said, causation isn’t automatically the sticking point in every case. When the treatment itself is undisputed, breach can end up carrying the whole fight instead.
A poor outcome doesn’t prove malpractice on its own. Surgery carries known risks. Diseases progress even under good care. There’s no fixed percentage that predicts how a case will turn out. The odds depend entirely on the medical records, the strength of the expert opinion behind the claim, and how clearly the evidence separates negligence from an outcome medicine couldn’t prevent.
Every Arizona medical malpractice claim rests on four elements:
These requirements reflect the elements Arizona law places on a claimant under A.R.S. § 12-563. A broader explanation of how negligence may be proven in an Arizona injury claim can help provide context for the evidence involved.
Duty isn’t automatic across an entire hospital or every professional you encountered during treatment. A radiologist who never reviewed your scan generally owes no duty on that particular failure. Establishing duty means identifying exactly who treated you, when, and in what capacity.
Breach is rarely obvious from the outside. A decision that looks wrong in hindsight may have been reasonable given what the provider knew at the time. That’s why breach almost always requires a qualified expert in the same specialty to explain what the standard of care required and where the provider fell short of it.
Causation demands more than a timeline. You have to show, to a reasonable medical probability, that the breach itself caused your injury, not just that the breach happened and an injury followed. A missed diagnosis followed by a worse outcome sounds causal, but the claim still has to show the delay changed the course of treatment enough to produce measurable harm.
Damages cover the losses that flow from that specific injury: medical bills, lost income, and documented pain and suffering. Not every expense connected to your underlying illness counts. If you were already facing surgery or ongoing treatment before the alleged breach, those baseline costs have to be separated from the additional burden the malpractice created.
Competing explanations make causation hard to pin down. A few common ones:
Defense experts routinely argue that the patient’s own disease process, not the provider’s conduct, explains the injury. Sorting a legitimate alternative explanation from a genuine breach means comparing what actually happened against what the standard of care called for at each specific point in treatment.
Take a delayed diagnosis as an example. The question isn’t whether the diagnosis came late. It’s whether an earlier diagnosis would have changed the treatment options, improved the prognosis, or avoided a specific injury you can now document. Cases involving a doctor who missed a potential fracture illustrate why the consequences of a delay matter to the causation analysis. Reconstructing that timeline from the actual records is usually where these cases are won or lost.
The same causation questions may arise when symptoms of a serious condition are overlooked, including situations involving potentially overlooked heart failure in children.
A treatment-error case raises a related question. Once the alleged departure from the standard of care is identified — a surgical mistake, a medication error, a missed follow-up — the case has to trace what happened right after it. That means comparing the immediate effects and the care that followed against what should have happened.
Records from the hours and days after the alleged error, compared with what should have happened, usually separate a preventable harm from a known complication no one could have avoided.
Start with a complete chronology, pulled from:
Arizona law puts the burden of proving each element on the patient bringing the claim, generally by a preponderance of the evidence, meaning it’s more likely than not that the claim is true. That makes this record-building work essential, not optional. Requesting the complete record, not just the parts that seem relevant, is usually the first real step in evaluating a case.
Qualified experts carry most of the weight from here. Under A.R.S. § 12-2604, an expert testifying about the standard of care must satisfy specific professional and specialty-related qualifications. An expert typically has to practice in the same specialty as the defendant and explain, based on the actual records, why the breach more likely than not caused the injury. One favorable opinion doesn’t automatically win a case, though. It’s often the comparison between opposing expert opinions that decides how a jury views causation.
Defense arguments tend to follow familiar patterns:
None of these are presumed true. Each has to be tested against the specific records and expert opinions in your case.
Arizona imposes its own procedural requirements on medical malpractice claims. Under A.R.S. § 12-2603, a claimant generally must certify whether expert testimony is necessary and, when required, serve a preliminary expert opinion affidavit with the applicable disclosures. Patients working with an experienced Coconino County medical malpractice lawyer face the same statewide framework, applied through local courts.
Under A.R.S. § 12-542, an Arizona medical malpractice action generally must be brought within two years after the cause of action accrues. The discovery rule and other circumstances can affect when a claim accrues or whether another rule applies, so the deadline should be confirmed against the specific facts rather than assumed.
You can start preserving what matters before you ever speak with an attorney:
A factual chronology built early, while memories and documents are fresh, makes the whole evaluation faster and more accurate.
Causation, most often. Connecting a provider’s breach to a specific additional injury takes more than showing a bad outcome. In some cases, though, breach itself is the real fight.
Duty, breach, causation, and damages. Each one has to be established separately, and missing any one of them can end a claim regardless of how the others look.
The patient bringing the claim. Arizona law generally requires proving each element by a preponderance of the evidence, meaning it’s more likely than not that the claim is true. A different evidentiary standard may apply in certain emergency-care cases.
There’s no reliable percentage. Outcomes depend on the medical records, the strength of expert testimony, and how clearly the evidence ties a specific breach to a specific injury.
Daniel B. Kaiser has practiced law in Arizona since 1997, and before law school he worked as an investigator. That background shapes how the firm approaches a potential medical malpractice claim: rebuilding an accurate timeline, identifying which element a case turns on, and connecting patients with qualified medical experts. It’s the same evidence-first approach investigative work demands.
The firm offers free initial consultations for Northern Arizona families weighing a possible claim, and an accomplished Flagstaff personal injury attorney can assist across a range of injury matters. Contact The Kaiser Law Group to talk through what happened.
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Flagstaff, AZ 86001
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