Misdiagnosed in the ER: Emergency Medicine Claims in the District of Columbia
The emergency room is where we go on the worst day — chest pain at 2 a.m., a thunderclap headache, a child who won't stop vomiting. Most ER teams perform heroically under impossible conditions. But the emergency department is also, by the federal government's own research, the most dangerous room in American medicine for one particular kind of error: the missed diagnosis.
The numbers, from the government's own review
In December 2022, the federal Agency for Healthcare Research and Quality published a systematic review of diagnostic error in U.S. emergency departments. Its estimates, drawn from hundreds of studies: among roughly 130 million annual ER visits, about 7.4 million patients — 1 in 18 — are misdiagnosed each year; about 2.6 million suffer an adverse event as a result; and roughly 370,000 suffer serious harm, including permanent disability or death. The same review identified the conditions most often missed: stroke, heart attack, aortic aneurysm and dissection, spinal cord injury and compression, and venous thromboembolism (blood clots).
Notice the pattern. These are not exotic diseases — they are the time-critical emergencies the ER exists to catch, and they share a trait: they can masquerade as something benign. The stroke that presents as dizziness. The heart attack labeled reflux. The aortic dissection discharged as back spasm.
What makes an ER misdiagnosis malpractice
A wrong diagnosis is not automatically negligence — medicine is probabilistic and emergency medicine doubly so. The legal question in the District is whether the providers deviated from the national standard of care for emergency clinicians facing that presentation, and whether the deviation caused the harm. In practice, ER diagnostic cases turn on process failures a jury can understand:
- red-flag symptoms documented but not pursued (the "worst headache of my life" that gets no imaging);
- abnormal vital signs or test results discharged without explanation;
- triage that anchored on the first, most comfortable diagnosis;
- failure to order the study the differential demanded, or to communicate a radiologist's finding;
- discharge without the return precautions that would have brought the patient back in time.
On causation, DC law is realistic about proof. As the D.C. Court of Appeals confirmed in affirming a verdict for an amputee patient in Providence Hospital v. Willis, 103 A.3d 533 (D.C. 2014), a plaintiff's expert need only opine to a reasonable degree of medical certainty that the negligence was more likely than anything else the cause of the harm — the patient does not have to disprove every alternative scenario a defense expert can imagine.
One more body of law belongs in the picture. A federal statute — the Emergency Medical Treatment and Labor Act — requires hospitals with emergency departments to provide an appropriate medical screening examination to everyone who comes in, and to stabilize emergency conditions before discharge or transfer, regardless of insurance or ability to pay. EMTALA is not a malpractice statute and does not federalize the standard of care, but where a patient was turned away, triaged into oblivion, or transferred unstably, it can supply a separate claim alongside the negligence case.
The DC-specific trap: 90 days' notice before you sue
The District requires written notice to each health-care provider you intend to sue at least 90 days before filing a medical malpractice action (D.C. Code § 16-2802). The general limitations period is three years, but the notice requirement is a separate, earlier tripwire — and courts have dismissed cases over defective notice. An ER case typically involves multiple potential defendants (the hospital, the physician group that staffs the ER, individual clinicians, radiology), each needing notice. This is not a claim to run close to any deadline.
What this means for injured people in the District of Columbia
- Trust the second look. If symptoms persist or worsen after an ER discharge, go back or see another provider promptly — it protects your health first and your potential claim second.
- Get the complete record, fast. ER cases are won in the triage notes, nursing flowsheets, vital-sign trends, and imaging orders. Request the full chart, not the discharge summary.
- Mind the 90-day notice. Counsel needs time to identify every provider entity and serve compliant notices well inside the limitations period.
- Expect a standard-of-care battle, not a sympathy contest. These cases are proven with emergency-medicine experts walking a jury through what the chart demanded — which is why early expert review, before filing, is how we evaluate them honestly.
Emergency medicine is hard. That is precisely why the standard of care exists — it is the profession's own definition of what a patient in extremis is entitled to, on the worst day, at 2 a.m. When it is not met and the missed hours cost a life or a future, the civil justice system is where accountability lives.
If you or a loved one has been hurt, call Posey Lebowitz at (202) 524-0123 or send us a message for a free consultation.
Part of our DMV case law archive, compiled in 2026 to reflect the archive of some of the most important decisions in injury law.