How payors are redefining "emergency", and why your ED claims are being denied.

The prudent-layperson standard is the rule that governs whether an emergency department visit must be covered. Federal law, state law, and most payor contracts adopt it explicitly. The standard is not new. The standard is also not, in 2026, what is governing the decision.

Across the firm's claims docket, and across the matters our clients are referring in from peer groups, we are seeing a structural shift in how commercial payors are processing emergency department claims. The legal standard has not changed. The application of it has.

What the rule says

The prudent-layperson standard, as codified at 42 U.S.C. § 1395w-22(d) for Medicare Advantage and broadly mirrored in commercial contracts, asks whether a person of average knowledge of medicine could reasonably believe that the absence of immediate medical attention would result in serious jeopardy to health, serious impairment of bodily functions, or serious dysfunction of a bodily organ or part.

It is, by design, a presenting-symptoms standard. The patient's discharge diagnosis is not the test. The patient's reasonable belief at the moment of presentation is the test.

The patient does not know, when the chest pain starts, whether it is a heart attack or a panic attack. The standard exists because they are not supposed to have to know.

What is changing

Three patterns are surfacing across the firm's recent claims work:

• Diagnosis-based denials. Carriers are increasingly routing claims to retrospective review based on the discharge ICD-10 code rather than the presenting complaint. A discharge of "non-specific chest pain" or "viral syndrome" is being treated, in practice, as evidence the visit was not an emergency.
• Algorithmic triage. Several major commercial carriers have deployed automated review systems that score claims against a list of "emergency" diagnoses. Claims falling outside the list are auto-denied for further review, with the burden of substantiation shifted to the provider.
• Narrowed network rules. Out-of-network ED claims are increasingly being processed at in-network rates only when the carrier's algorithm classifies the visit as a true emergency, a determination made after the fact, against the discharge code, not the presenting symptoms.

What to do about it

The legal posture of the appeal matters. Generic denial letters on emergency claims often invite generic responses. A response that engages the prudent-layperson standard explicitly, that quotes the contract language back to the carrier, and that documents the presenting symptoms in the four corners of the chart is materially more likely to succeed.

Three operational changes that move the needle for the practices we represent:

• Document presenting complaints in the patient's words, in the chart, before the workup begins. The chart note that says "patient reports crushing substernal chest pain, 8/10, radiating to left arm" is a different document, legally, than the chart note that says "chest pain, ruled out MI."
• Track the denial pattern. If a single carrier is denying ED claims at a rate materially above baseline, the pattern itself is a basis for action, at the contract level, the regulatory level, or the litigation level.
• Appeal early and in writing. Do not let a verbal correction by the call center stand as the resolution; verbal corrections do not establish the administrative record needed for downstream review.

Where this is heading

The legal standard is not going to change. The carriers' interpretation of it will continue to drift in the direction of cost containment unless and until the cost of that drift, through appeals, through state insurance department complaints, and through litigation, exceeds the savings. Provider participation in that cost calculation is what determines the outcome at the regulatory level.

If you are seeing pattern denials of emergency department claims and you would like the firm to evaluate the appeal posture, we are happy to take a look. Reach out here.