You choose an in-network hospital for your surgery. You check that your surgeon is in-network. Then a bill arrives from an anesthesiologist you never met — an out-of-network provider who was part of your care team without your knowledge. This is surprise medical billing, and it happens to millions of Americans every year.
The good news: federal law now protects patients from many forms of surprise billing. Here's what you need to know.
What Is Surprise Medical Billing?
Surprise billing occurs when you receive care from a provider who is out of your insurance network — often without your knowledge or consent — and then get billed for amounts beyond your normal cost-sharing.
Common surprise billing scenarios:
- Emergency care: You're taken to an out-of-network ER or treated by an out-of-network ER physician at an in-network hospital
- Ancillary providers: Your in-network surgery involves an out-of-network anesthesiologist, assistant surgeon, or radiologist
- Air ambulance: Emergency air transport is frequently out-of-network
- Specialist referrals: Your in-network doctor refers you to an out-of-network specialist
What Is Balance Billing?
Balance billing is when a provider bills you for the difference between their full charge and what your insurer paid, beyond your standard cost-sharing obligations (deductible, co-pay, co-insurance).
Example: A procedure costs $5,000. Your insurer pays $3,000. Your plan requires a $500 deductible. The provider bills you $2,000 — the "balance" — rather than just $500. This is balance billing, and it's now illegal in many situations under federal law.
Key distinction: Balance billing that violates your plan terms is an overcharge you can dispute. Balance billing by out-of-network providers in non-emergency situations may be legal if you signed a waiver. The No Surprises Act defines exactly when providers are and aren't permitted to balance bill.
The No Surprises Act: Your Federal Protection
The No Surprises Act took effect on January 1, 2022, and provides significant protections for patients with private health insurance:
- Emergency services: You can't be charged more than in-network cost-sharing, regardless of the provider's network status
- In-network facilities: Out-of-network providers at in-network facilities can't surprise-bill you without your advance written consent — and that consent must be given at least 72 hours in advance
- Air ambulance: Air ambulance services are now limited to in-network cost-sharing amounts
- Good Faith Estimates: Providers must give you a written cost estimate before scheduled care
Note: The Act applies to most private insurance plans but not to Medicare, Medicaid, or TRICARE, which have separate protections.
Out-of-Network Billing: What's Legal and What Isn't
Out-of-network billing isn't always illegal — the key question is whether you gave informed consent and whether the situation is one the No Surprises Act covers.
Out-of-network billing is illegal (under the NSA) when:
- You received emergency care
- An out-of-network provider treated you at an in-network facility without your advance written consent
Out-of-network billing may be legal when:
- You chose an out-of-network provider for non-emergency care and signed a consent form in advance
- The provider is at an out-of-network facility that you chose
How to Dispute a Surprise Medical Bill
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Confirm the bill is a surprise billCheck your EOB from your insurer to confirm the provider was out-of-network and that you didn't sign a consent waiver in advance. Request the itemized bill to see exactly what was charged.
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Contact your insurer firstReport the surprise bill to your insurer and ask them to handle it under the No Surprises Act. Your insurer is required to process the claim as if the provider were in-network.
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Send a written dispute to the providerWrite to the billing department citing the No Surprises Act and stating that you are only responsible for your in-network cost-sharing amount. Bill Reclaim can generate this letter for you.
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File a federal complaint if neededIf the provider refuses to comply, file a complaint at cms.gov/nosurprises. Federal authorities can investigate and penalize providers who violate the law.
What About Medical Balance Billing by In-Network Providers?
Even in-network providers sometimes bill patients incorrectly — charging you for amounts your insurer should have covered, applying the wrong co-pay, or billing for services that should have been covered under your plan. These are billing errors, not surprise bills, but they're equally disputable.
Use the medical bill review process to identify these errors and the dispute process to correct them.