Why Emergency Physicians Get Sued: The Missed MI, the Missed Stroke, and the Discharge That Becomes the Case

By John Mahoney · June 2026 · 9 min read

Emergency medicine sits at the opposite end of the spectrum from a specialty like pathology. The emergency physician sees the patient once, for an hour, often at 3 a.m., with no prior records, an incomplete history, and a waiting room backing up behind the curtain. That structure — high volume, high acuity, high uncertainty, and almost no longitudinal relationship — makes emergency medicine one of the highest claim-frequency specialties in medicine. The allegation is almost always the same shape: a patient came in with a real but evolving condition, was worked up, was discharged or admitted to the wrong service, and the diagnosis was made too late.

This guide walks through what the closed-claims data shows about why emergency physicians get sued — how the "can't-miss" diagnoses dominate, how premature closure and the un-repeated vital sign create the case, and what a plaintiff or defense attorney should look for first when triaging an emergency department (ED) file.

Disclaimer: This article is for informational purposes only and is not legal or medical advice. Closed-claims figures vary by source, era, and definition, and the standard of care is jurisdiction- and fact-specific. Always verify the controlling standard and obtain independent expert review of the actual record before relying on any generalization.

The Frequency and Severity Reality

Emergency medicine consistently ranks among the higher-risk specialties by claim frequency, even though its per-claim severity is moderate compared with obstetrics or neurosurgery. Closed-claims analyses repeatedly identify failure to diagnose as the single largest allegation category — commonly reported as roughly half of ED malpractice claims — with medication and procedural errors making up much of the remainder. The pattern matters for case selection: the typical viable ED case is not a botched procedure, it is a diagnosis that the record shows should have been reachable with the information in front of the physician.

Severity concentrates in a short list of conditions. A small number of "high-acuity, low-frequency" diagnoses — the ones that are rare in any single shift but catastrophic when missed — account for a disproportionate share of paid claims and indemnity dollars. When the missed diagnosis is a myocardial infarction, a stroke, or a pulmonary embolism, the damages are death or permanent disability, and the case value follows.

The "Can't-Miss" Diagnoses That Drive the Claims

The recurring defendants in ED litigation are a familiar set of time-sensitive, high-stakes conditions whose early presentations are notoriously atypical:

Acute coronary syndrome / MI — the atypical presentation (the woman, the diabetic, the patient with epigastric pain and a "normal-looking" first ECG) discharged before serial troponins or a repeat ECG. The early-discharged MI is the archetypal ED case.
Stroke — especially posterior-circulation stroke presenting as dizziness, nausea, or vague imbalance, mislabeled as a peripheral or benign process, with the tPA/thrombectomy window missed.
Pulmonary embolism — dyspnea or pleuritic pain attributed to anxiety or a musculoskeletal cause, with no risk stratification (Wells/PERC) documented and no D-dimer or CT obtained.
Aortic dissection — "tearing" chest or back pain treated as ACS or renal colic; one of the most-missed lethal diagnoses in the ED.
Sepsis — abnormal vitals not re-checked, lactate not drawn, antibiotics delayed past the window the chart later makes obvious.
Spinal epidural abscess and cauda equina — back pain with subtle neuro findings or red flags (fever, retention, IVDU history) discharged without imaging.
Ectopic pregnancy, meningitis, testicular torsion, appendicitis — the classic "atypical presentation" group where the time-to-diagnosis is the whole case.

The Mechanism: Premature Closure and the Vital That Wasn't Repeated

Most ED cases are not about a physician who lacked knowledge. They are about cognitive and system failures that the record documents in real time. The dominant theme is premature closure — anchoring on an early, benign-sounding explanation and stopping the workup before the dangerous alternative is excluded. The chart shows it: a triage note with a concerning vital, an early working diagnosis, and a disposition that never revisited the original red flag.

Two documentation patterns recur in nearly every viable claim:

The abnormal vital sign at discharge. A patient is sent home tachycardic, hypotensive, hypoxic, or febrile, with no note acknowledging or rechecking it. The discharge vital that was never repeated is the most quietly devastating fact in ED litigation — it is objective, it is time-stamped, and no expert can explain it away.
The discharge instructions and return precautions. The case often turns on whether the patient was told what to watch for and when to come back — and whether that conversation is documented. Vague or boilerplate instructions, with no condition-specific return precautions, are a frequent finding.

For the attorney, this means the ED case lives or dies on the timeline: the exact sequence and timing of vitals, the gap between an abnormal value and the next reading, the time from arrival to ECG, to troponin, to CT, to disposition. The standard-of-care argument is almost always a timing argument.

System Factors: Boarding, Handoffs, and EMTALA

Emergency medicine claims frequently implicate the system, not just the individual. Overcrowding and boarding, shift-change handoffs where the ball is dropped, and the failure to act on a result that returned after the patient left are structural drivers. EMTALA (the Emergency Medical Treatment and Labor Act) adds a parallel federal layer: failure to provide an adequate medical screening exam or to stabilize before transfer creates statutory exposure distinct from ordinary negligence, and the screening-exam documentation is its own battleground.

Triaging the ED File: Plaintiff vs. Defense

Both sides start in the same place — the timeline — but read it differently:

Question	Plaintiff lens	Defense lens
Vitals trend	Was an abnormal vital ignored or un-repeated before discharge?	Was the abnormality transient, addressed, and reasonably interpreted in context?
Workup completeness	Was a can't-miss diagnosis never risk-stratified or excluded?	Was the workup appropriate to the presentation that actually existed at the time?
Disposition	Did the discharge ignore documented red flags?	Was the disposition reasonable on the information available, judged prospectively?
Documentation	Are return precautions absent or boilerplate?	Do contemporaneous notes show sound clinical reasoning?

The defense's strongest move is almost always the retrospective-bias argument: the diagnosis is obvious now, with the outcome known, but the question is whether it was reachable then, with an atypical presentation and a normal-appearing first test. The plaintiff's strongest move is the objective data the chart can't walk back — the un-repeated vital, the missing serial test, the result that returned to an empty room.

Where the Record Review Actually Happens

Every one of these arguments is won or lost in the medical records — usually hundreds of pages of triage notes, nursing flowsheets, ECG strips, lab time-stamps, and physician documentation that have to be assembled into a single, defensible sequence of who knew what, when. That assembly is the tedious part: building the minute-by-minute timeline, pinning every fact to its Bates page, and surfacing the gap between an abnormal vital and the next reading.

It is also exactly the part that should be verifiable. An AI-assisted chronology is only useful to a litigator if every entry traces back to the exact page of the record that supports it — so you can stand behind it in a deposition, not just trust it. That is the difference between a tool that saves you the grunt work and one that introduces a fact you can't defend.

See it before you trust it

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The emergency department is where medicine's hardest decisions get made with the least information and the most time pressure — which is exactly why the record, read carefully and in order, is the whole case. Whether you are building it or defending it, start with the timeline, and make sure every line of it can be traced back to the page it came from.