Out-of-network emergency denials
The federal No Surprises Act (NSA), effective 2022, prohibits balance billing and most out-of-network cost-sharing for emergency services regardless of facility or provider network status. Denials and balance bills that violate the NSA are appealable, and providers face federal independent dispute resolution (IDR) rather than billing the patient.
The rule that controls this: The prudent-layperson standard controls: emergencies are judged by the symptoms that sent you in, not the final diagnosis, so a retrospective 'non-emergent' downgrade is challengeable. The No Surprises Act (PHS Act § 2799A-1; 45 C.F.R. Part 149) then bars out-of-network cost-sharing and balance billing through post-stabilization.
Last reviewed 13 September 2026 · General information, not legal or medical advice · Apellica is not a law firm
What gets denied
- Emergency department visits at out-of-network hospitals
- Out-of-network emergency physicians (ED docs, radiologists, pathologists, anesthesiologists)
- Post-stabilization services before transfer
- Air and ground ambulance (air covered by NSA; ground varies by state)
- Out-of-network providers at in-network facilities
Common denial reasons
- Plan paid only the 'allowed amount' and applied balance to the patient
- Plan denied as out-of-network without honoring the emergency exception
- Provider billed patient directly in violation of NSA
- Plan claims service was non-emergent retrospectively
How we approach the appeal
Invoke the No Surprises Act directly. Federal rules require the plan to apply in-network cost-sharing to emergency services and prohibit balance billing for covered NSA services. File a complaint with the federal No Surprises Help Desk (CMS) if a provider continues to bill. Push the plan to issue a 'qualifying payment amount' and route disputes to federal IDR, not to the patient.
- Emergency care is judged by what a prudent layperson would think
- No Surprises Act: out-of-network bills you cannot be charged
- Network gap: when no in-network provider can do it
- How to write the medical-necessity letter
- How to fight a denial, start to finish
- OON emergency appeal letter template
- Work out your appeal deadline
Internal appeal: 180 days. NSA complaints to CMS can be filed at any time. State surprise-billing laws may add additional protections in some states.
$1,000 - $250,000+
- · Denial / EOB showing OON treatment
- · Hospital and provider bills
- · Emergency department records
- · Insurance card and policy summary
- · Any balance-bill notices received
Out-of-network emergency denial? Let's appeal it.
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OON emergency denials by insurer
What each plan tends to cite, and the rule that controls it.
- UHC oon emergency denials
- Aetna oon emergency denials
- Cigna oon emergency denials
- BCBS oon emergency denials
- Humana oon emergency denials
- Medicare oon emergency denials
- Kaiser oon emergency denials
- Ambetter oon emergency denials
- Molina oon emergency denials
- BCBS FEP oon emergency denials
- TRICARE oon emergency denials
- WellCare oon emergency denials
This page provides general information about appeal strategy. It is not legal advice. Outcomes depend on documentation, plan terms, and timing.