Surprise Billing
Definition
Surprise billing (also called surprise medical billing or unexpected balance billing) occurs when a patient receives care from an out-of-network provider without prior knowledge and is billed for the difference between the provider's charge and the insurance payment. The No Surprises Act (effective January 1, 2022) prohibits surprise billing for emergency services and certain non-emergency services at in-network facilities. See No Surprises Act rules.
Why Surprise Billing Matters
Before federal protection, 1 in 5 emergency visits and 1 in 6 in-network hospitalizations resulted in a surprise bill. Average surprise bills ranged from $750 to $2,600. The No Surprises Act shifts the payment dispute from the patient to the provider and payer through an independent dispute resolution (IDR) process. Providers must comply or face penalties of up to $10,000 per violation.
How the Protections Work
Emergency services: Patient pays in-network cost-sharing regardless of provider network status. The provider and payer negotiate or go to IDR. Non-emergency at in-network facility: Out-of-network providers (anesthesiologists, radiologists, pathologists) cannot balance bill the patient. Exception: the provider can balance bill if they give written notice 72 hours before the service AND the patient signs a consent form. See balance billing and surprise billing protection rules.
Related Terms
Balance billing — the broader category that includes surprise billing. Out-of-network — the provider status that triggers surprise billing. In-network — providers bound by contractual limits. Appeal process — IDR is the appeal mechanism under the No Surprises Act.
Common Questions
Does the No Surprises Act apply to all insurance plans?
It applies to commercial insurance, federal employee health plans, and marketplace plans. It does not apply to Medicare (which has its own balance billing rules), Medicaid, TRICARE, or VA benefits, which have separate patient protection frameworks.
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This glossary is for informational purposes. Consult official billing guidelines and payer policies for definitive definitions. Last updated: 2026-04-06.