Emergency medicine billing
Every other guide in this collection begins with eligibility. Confirm coverage, check the benefit, obtain the authorization, then treat. In the emergency department that order is not merely impractical -- it is regulated against. 42 CFR 489.24 requires a screening examination for anyone who comes to the emergency department regardless of ability to pay, forbids delaying it to ask how they intend to pay, and forbids seeking authorization for screening or stabilization until the screening has been done and stabilizing treatment has begun.
- The screening obligation applies regardless of Medicare eligibility and regardless of ability to pay
- Payment or insurance inquiries may not delay screening or stabilizing treatment
- Authorization may not be sought until screening has happened and stabilizing treatment has been initiated
- Reasonable registration is permitted, and may not unduly discourage a patient from remaining
This is an educational guide to how billing works for emergency medicine — its workflow, coding, and payer considerations. It is general information, not a statement that US Medical Billing serves this specialty, and not billing, coding, or legal advice.
What makes emergency medicine billing distinct
The governing rule is a condition of participation rather than a payment rule, and it inverts the sequence every other revenue cycle depends on. 42 CFR 489.24(a) provides that where an individual comes to the emergency department of a hospital that has one -- whether or not eligible for Medicare benefits and regardless of ability to pay -- the hospital must provide an appropriate medical screening examination within the capability of the emergency department, including ancillary services routinely available to it, to determine whether an emergency medical condition exists; and, where one does, must provide necessary stabilizing treatment or an appropriate transfer. Eligibility is not a precondition of the service. It is not even a permitted question if asking it would slow the service down.
The regulation then says so explicitly, twice. Paragraph (d)(4)(i) provides that a participating hospital may not delay providing an appropriate medical screening examination, or the further medical examination and treatment required to stabilize, in order to inquire about the individual's method of payment or insurance status. Paragraph (d)(4)(ii) goes further and reaches the payer: a hospital may not seek, or direct an individual to seek, authorization from the individual's insurance company for screening or stabilization services to be furnished by a hospital, physician or nonphysician practitioner until after the screening examination has been provided and any further examination and treatment required to stabilize the emergency medical condition has been initiated. Prior authorization, the single most common front-end control in medical billing, is prohibited at the point where it would normally be applied.
What is permitted is narrower than it first appears and is described just as carefully. Paragraph (d)(4)(iv) allows hospitals to follow reasonable registration processes for individuals for whom examination or treatment is required, including asking whether an individual is insured and, if so, what that insurance is, as long as the inquiry does not delay screening or treatment -- and adds that reasonable registration processes may not unduly discourage individuals from remaining for further evaluation. The registration desk is therefore doing something legally distinct from what a clinic's front desk does: gathering the same information, forbidden from conditioning anything on it, and constrained in how insistently it may ask.
The screening obligation is also drawn geographically in a way that surprises people. The regulation defines hospital property as the entire main hospital campus, including the parking lot, the sidewalk and the driveway, while excluding areas or structures of the main building that are not part of the hospital, such as physician offices, rural health centers, skilled nursing facilities and other entities that participate separately under Medicare, or restaurants, shops and other non-medical facilities. It also states where the obligation ends: where a hospital has screened an individual, found an emergency medical condition, and admits them as an inpatient in good faith in order to stabilize it, the hospital has satisfied its responsibilities under the section.
Against that inverted front end sits a coding rule that keys on the same act the regulation constrains. The Claims Processing Manual defines the emergency department as an organized hospital-based facility for the provision of unscheduled or episodic services to patients who present for immediate medical attention, states that any physician seeing a patient registered in the emergency department may use the emergency department visit codes without being assigned to the department, and states plainly that services in the emergency department may not be emergencies -- the codes are payable if the described services are provided. Conversely, where a physician asks a patient to meet them in the emergency department as an alternative to the office and the patient is not registered as an emergency department patient, office or outpatient visit codes are billed instead. Registration decides the code family; acuity does not.
How emergency medicine billing flows
The cycle runs backwards relative to every other outpatient setting: the service happens, and then the questions are asked.
Arrival and the screening obligation
The screening examination is owed to anyone who comes to the emergency department, regardless of coverage or ability to pay. Nothing in the revenue cycle may be placed in front of it, and the obligation reaches across the whole hospital campus as the regulation defines it.
Common operational challenges
Everything here follows from a revenue cycle whose first stage is legally required to come last.
No front-end control to lean on
Eligibility verification, benefit checks and prior authorization -- the three controls that prevent most denials elsewhere -- are unavailable, restricted or prohibited at the point they would normally be applied. The controls have to be rebuilt after the encounter instead.
Registration data gathered under constraint
The desk may ask about insurance but may not condition care on the answer, may not delay care to get it, and may not press in a way that discourages a patient from staying. Demographic and coverage capture is therefore less complete than anywhere else, by design.
A patient population with no prior relationship
Most arrivals are unknown to the department, so identifiers, coverage and responsible-party details are established from scratch under time pressure, and errors in them surface later as rejections rather than as denials.
Two claims from one encounter
The professional and facility sides bill separately for the same visit, on different forms, to the same payer. When their descriptions of the encounter diverge, each is adjudicated against a record the other created.
Documentation and coding considerations
The notes below describe regulatory obligations and reporting rules from the Medicare regulations and manuals; they do not reproduce any code descriptions.
The screening obligation, and who it covers
42 CFR 489.24(a)(1) requires an appropriate medical screening examination within the capability of the emergency department, including ancillary services routinely available to it, for any individual who comes to the emergency department -- whether or not eligible for Medicare benefits and regardless of ability to pay -- performed by an individual determined qualified by hospital bylaws or rules.
The two prohibitions on the front end
A hospital may not delay screening or stabilizing treatment in order to inquire about method of payment or insurance status, and may not seek or direct the individual to seek authorization from their insurer for screening or stabilization services until screening has been provided and stabilizing treatment initiated.
What registration may still do
Reasonable registration processes are permitted, including asking whether the individual is insured and what that insurance is, provided the inquiry does not delay screening or treatment, and provided the process does not unduly discourage the individual from remaining for further evaluation.
Documentation of a refusal
Where the hospital offers examination and treatment, informs the individual of the risks and benefits, and the individual does not consent, the medical record must contain a description of what was refused and the hospital must take all reasonable steps to secure a written informed refusal. The same structure applies to a refused transfer, with the reasons stated.
Registration, not acuity, selects the code family
Any physician seeing a patient registered in the emergency department may use the emergency department visit codes without being assigned to the department. The manual states that services in the emergency department may not be emergencies and the codes are payable where the described services are provided -- and that a patient met there instead of at the office, and not registered, is billed as an office or outpatient visit.
Denial and rejection risks
The characteristic losses here are rejections and uncollected balances rather than clinical denials.
Registration data captured incompletely
Identifiers, coverage and responsible-party details gathered under a constraint against delay are the leading source of front-end rejections in this setting. A rejected claim was never adjudicated, so it is invisible on a denial report.
Coverage discovered after the fact, or not at all
Because eligibility cannot gate the service, a proportion of encounters are billed to the wrong payer or to the patient. Retrospective coverage discovery becomes a revenue-cycle function rather than an exception process.
Emergency department codes used outside the department
The manual restricts these codes to patients seen in the emergency department. A patient asked to meet a physician there as an alternative to the office, and not registered as an emergency department patient, is billed on the office or outpatient family instead.
Professional and facility claims that disagree
Two claims describe one encounter from two systems. Divergence in diagnoses, times or the services recorded gives the payer two accounts to adjudicate against each other.
Same-day nursing facility admission
The manual states that an emergency department visit provided on the same day as a comprehensive nursing facility assessment is not paid, because evaluation and management on that date at other sites is included in the initial nursing facility care.
Payer-process considerations
A federal obligation to treat first meets a payer apparatus built to decide first, and the gap is where this specialty's disputes live.
Authorization that cannot precede the service
Because the regulation prohibits seeking authorization for screening and stabilization until after they are underway, any payer requirement framed as prior authorization for those services is answered retrospectively -- a structural mismatch rather than an operational failure.
Retrospective review of the presenting complaint
Plans may review emergency claims after the fact against the presenting symptoms rather than the final diagnosis. The record of what the patient presented with, at triage, is therefore load-bearing in a way the discharge diagnosis is not.
Out-of-network care the patient did not choose
Emergency patients do not select the hospital or the treating physician, which places these services inside the federal surprise-billing framework. Network status becomes a revenue-cycle and disclosure question rather than a contracting footnote.
A high proportion of self-pay and uncertain coverage
With eligibility resolved after the encounter, the department carries more unverified and uninsured balances than any other setting, which makes financial assistance policy and coverage discovery part of the ordinary process.
Revenue-cycle checkpoints
The first two are compliance controls that happen to protect revenue; the rest rebuild the front end after the fact.
- Confirm no step in the registration or financial process is positioned so that it can delay screening or stabilizing treatment
- Confirm authorization is not sought for screening or stabilization services before screening has been provided and stabilization begun
- Capture identifiers and coverage as completely as the constraint allows, and route the gaps to retrospective discovery rather than to write-off
- Record the presenting complaint at triage, because retrospective payer review is generally against symptoms rather than the final diagnosis
- Document a refused examination, treatment or transfer with what was refused and a written informed refusal where obtainable
- Confirm the patient was registered in the emergency department before using the emergency department code family
- Reconcile the professional and facility claims for the same encounter before either is released
- Track network status by facility and physician group, because the patient chose neither
Related & connected
Services, tools, background reading and definitions that connect to the emergency medicine revenue-cycle steps above.
Related services
- Eligibility & verificationCoverage discovery rebuilt after the encounter, because it could not run before it.
- Patient billing & supportA setting carrying more unverified and self-pay balances than any other, by regulation.
- Denial managementWorking retrospective review against the presenting complaint rather than the final diagnosis.
Calculators & tools
- New patient registration data checklistThe identifiers and coverage details to capture when nothing was gathered in advance.
- No Surprises Act patient notice checklistThe disclosure requirements around care a patient did not choose the provider for.
- Patient cost estimatorEstimating a balance for an encounter whose coverage was established after the fact.
From the Knowledge Base
- What is the No Surprises ActThe framework governing emergency and out-of-network care the patient did not choose.
- Registration data quality and eligibilityWhy the completeness of what the desk captures decides how many claims are rejected.
- Professional and institutional claimsThe operational differences between the two claims one emergency encounter produces.
- Financial assistance policyThe policy a setting with unavoidable uninsured volume relies on rather than improvises.
Glossary
- Prior authorizationThe control this setting is prohibited from applying before screening and stabilization.
- Eligibility verificationThe front-end step that here happens after the service rather than before it.
- No Surprises ActThe framework covering care from a provider the patient had no opportunity to choose.
- Self-payThe status a larger share of this setting's encounters carry, unavoidably.
Frequently asked questions
Can an emergency department check insurance before treating a patient?
It can ask, but it cannot wait. 42 CFR 489.24(d)(4)(i) provides that a participating hospital may not delay providing an appropriate medical screening examination, or the further examination and treatment required to stabilize an emergency medical condition, in order to inquire about the individual's method of payment or insurance status. Paragraph (d)(4)(iv) then confirms that hospitals may follow reasonable registration processes, including asking whether an individual is insured and if so what that insurance is, as long as the inquiry does not delay screening or treatment -- and adds that those processes may not unduly discourage individuals from remaining for further evaluation.
Can prior authorization be obtained before emergency treatment?
Not for the screening or the stabilizing treatment. 42 CFR 489.24(d)(4)(ii) states that a participating hospital may not seek, or direct an individual to seek, authorization from the individual's insurance company for screening or stabilization services to be furnished by a hospital, physician or nonphysician practitioner until after the hospital has provided the appropriate medical screening examination and initiated any further medical examination and treatment required to stabilize the emergency medical condition. The regulation separately preserves the ability of an emergency physician or nonphysician practitioner to contact the individual's own physician for clinically relevant advice at any time, so long as the consultation does not inappropriately delay the required services.
Does the obligation apply to patients who are not Medicare beneficiaries?
Yes. The regulation states the screening obligation applies where an individual comes to the emergency department whether or not eligible for Medicare benefits and regardless of ability to pay. It is a condition of the hospital's participation in Medicare rather than a Medicare payment rule, so it governs the hospital's conduct toward everyone who arrives. The regulation also defines hospital property broadly for this purpose -- the entire main hospital campus including the parking lot, sidewalk and driveway -- while excluding separately participating entities and non-medical facilities on the campus.
When does the hospital's obligation under this rule come to an end?
At a defined point. Where a hospital has screened an individual, found an emergency medical condition, and admits that individual as an inpatient in good faith in order to stabilize the condition, the regulation states that the hospital has satisfied its special responsibilities under the section with respect to that individual. It also states that the section is not applicable to an inpatient admitted for elective, non-emergency diagnosis or treatment, and that the hospital remains bound by the conditions of participation governing care of its inpatients.
Are the emergency department visit codes only for actual emergencies?
No, and the manual says so directly: services in the emergency department may not be emergencies, and the codes are payable if the described services are provided. What matters is registration and setting. Any physician seeing a patient registered in the emergency department may use the emergency department visit codes, without being assigned to the department. Conversely, where a physician asks their own patient to meet them at the emergency department as an alternative to the office and the patient is not registered as an emergency department patient, the appropriate office or outpatient visit codes are billed instead. The manual defines the emergency department as an organized hospital-based facility for unscheduled or episodic services to patients presenting for immediate medical attention.
Sources
Last reviewed August 1, 2026.
- Office of the Federal Register / eCFR42 CFR 489.24 Special responsibilities of Medicare hospitals in emergency cases -- paragraph (a) requiring an appropriate medical screening examination for any individual who comes to the emergency department whether or not eligible for Medicare benefits and regardless of ability to pay; paragraph (b) defining emergency medical condition and hospital property; paragraph (d)(2) ending the obligation on a good-faith inpatient admission to stabilize; paragraph (d)(3) on documenting a refusal of examination or treatment; and paragraph (d)(4) prohibiting delay to inquire about method of payment or insurance status, prohibiting authorization from being sought before screening and stabilization, and permitting reasonable registration processes that do not delay care or unduly discourage the individual from remaining
- Centers for Medicare & Medicaid Services (CMS)Medicare Claims Processing Manual (Pub. 100-04), Chapter 12 §30.6.11 Emergency Department Visits -- the definition of an emergency department as an organized hospital-based facility for unscheduled or episodic services to patients presenting for immediate medical attention; the rule that any physician seeing a patient registered in the emergency department may use the emergency department codes; the statement that services there may not be emergencies and the codes remain payable; the office-visit rule where the patient was met there but not registered; the non-payment of an emergency department visit on the same day as a comprehensive nursing facility assessment; and the allocation of services where a personal physician attends alongside the emergency physician
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