You did everything right. You checked that the hospital was in your insurance network. You scheduled the surgery with a surgeon who was covered. You confirmed coverage before the procedure. Then, a few weeks after you came home, a bill arrived from a company you had never heard of. The anesthesiologist. The bill is for $3,800, none of which your insurer is covering.
This is a surprise bill. It happens millions of times a year. And since 2022, federal law gives you significant power to fight it.
In summary
An out-of-network surprise bill occurs when a provider who participated in your care was not in your insurance network, even though you chose an in-network facility. The No Surprises Act, effective January 2022, caps your liability at the in-network cost-sharing amount for most emergency care and for many scheduled procedures at in-network facilities. If you received a surprise bill that should be covered by the law, your first call should be to your insurer, not to the billing department of the out-of-network provider.
Why surprise bills happen
Surprise bills occur because hospitals contract with facility-based providers - anesthesiologists, radiologists, pathologists, and surgical assistants - who operate under separate billing arrangements and may not be in your insurance network even when the hospital itself is. This assumption is wrong, and it is not your fault for making it.
Hospitals employ or contract with many providers who bill independently. Anesthesiologists are often employed by separate groups. Radiologists who read your scans may be from an outside practice. The assistant surgeon who helped in the operating room may not be in your insurance company's network even if the lead surgeon is. Pathologists who analyze tissue samples operate the same way.
These are "facility-based" providers. You did not choose them. You may not have met them. You had no opportunity to check their network status before receiving their services. For decades, this meant patients were legally responsible for the balance after insurance paid the in-network rate. The No Surprises Act eliminated that exposure in most of these situations.
What the No Surprises Act does for you
The law establishes a simple rule for most surprise billing situations: the patient's cost-sharing cannot exceed the in-network amount, even if the provider is out of network. Your in-network deductible, copay, and out-of-pocket maximum apply. The balance between what your insurer pays and what the provider wants is a dispute between the insurer and the provider. You are not responsible for it.
The law covers emergency services at any facility, in-network or out-of-network. It also covers non-emergency care at in-network facilities for services where the patient had no practical ability to choose a provider. The "no meaningful choice" requirement is key and covers the anesthesiologist, radiologist, pathologist, and assistant surgeon scenarios almost universally. Read the full guide to the No Surprises Act.
How to recognize a surprise bill
A surprise bill typically arrives weeks after care, from a company or group name you do not recognize, for an amount your insurer has paid nothing or almost nothing toward. The bill may show a large "patient responsibility" line despite the fact that you never chose this provider and your insurer has not processed the claim at the in-network rate.
Check the provider's name against your insurance company's online directory. If the provider does not appear, or appears with an "out of network" designation, and the service was rendered at an in-network facility or during emergency care, you likely have a surprise bill situation covered by the law.
Step-by-step: how to fight a surprise bill
Step 1: Do not pay immediately
Paying any amount on the bill before establishing your rights under the No Surprises Act can complicate your dispute. Hold the bill. You have time. Providers typically cannot send a bill to collections for at least 60 to 180 days, and federal rules prohibit adverse actions during active complaint investigations.
Step 2: Call your insurance company
Call the member services number on your insurance card. Tell them you received a bill from an out-of-network provider for services at an in-network facility (or during emergency care). Ask specifically: "Is this covered by the No Surprises Act?" Ask them to process the claim at the in-network rate and send you an updated Explanation of Benefits.
Most insurers have dedicated teams for No Surprises Act claims and will move quickly once you raise the issue. If the representative is unfamiliar with the law, ask to be transferred to the billing disputes or cost-sharing department.
Step 3: Send written notice to the billing provider
Write a brief letter to the billing company on the surprise bill. State that you believe the charges are subject to the No Surprises Act, that you are working with your insurer to process the claim at the in-network rate, and that you request they hold the account pending resolution. Send by certified mail and keep the return receipt. This creates a timestamped record that you raised the dispute formally. See the full dispute letter guide.
Step 4: File a federal complaint if needed
If the provider continues to pursue the balance or your insurer does not process the claim correctly, file a complaint with the Centers for Medicare and Medicaid Services at cms.gov/nosurprises or by calling the No Surprises Help Desk at 1-800-985-3059. CMS investigates complaints and can take enforcement action against providers that violate the law. Include copies of your bill, your EOB, and any correspondence with the insurer and provider.
Step 5: Check your state law
Many states had surprise billing protections before the federal law, and some provide additional coverage. State law may protect you in situations the federal law does not cover, such as ground ambulances or certain self-funded plan situations. Search "[your state] surprise billing law" or contact your state's Department of Insurance.
When the No Surprises Act does not apply
The law has gaps that are worth knowing before you start a dispute.
Ground ambulances are excluded. If you were billed by a ground ambulance service that was out of network, the federal law does not cap your liability. Some states cover this; many do not.
If you signed an advance consent form acknowledging that a specific provider was out of network and agreeing to pay the higher cost, the law may not protect you for that provider. This exception is narrow. The notice must have been given at least 72 hours before a scheduled procedure, it must have named the specific provider, and you must have signed it voluntarily with an in-network alternative available. A consent form you signed in the ER does not satisfy this requirement.
Some self-funded employer plans governed only by ERISA and not by state insurance law have limited coverage under the federal rules. If you have an employer-sponsored plan, contact your HR department to confirm whether the plan is fully insured or self-funded.
Frequently asked questions
Can I be balance billed if I was told I might see an out-of-network provider and I said nothing?
Silence is not consent under the No Surprises Act. The law requires that providers give you a specific written notice, in a language you understand, naming the out-of-network provider, explaining the estimated cost, and offering an in-network alternative if one is available. Verbal notice, general consent forms, or notices that do not name the specific provider are insufficient. If you did not receive a proper written notice, the balance billing prohibition applies.
The provider says they are exempt from the No Surprises Act. Is that possible?
Some providers are genuinely exempt, primarily those employed by certain self-funded government and church plans. However, many providers claim exemptions that do not hold up under scrutiny. If a provider claims to be exempt, ask them to identify the specific exemption in writing. Contact your state insurance commissioner and CMS to verify the claim before accepting the balance.
What happens to my credit score if a surprise bill goes to collections while I am disputing it?
Under rules finalized in 2023, medical debt under $500 is excluded from consumer credit reports entirely. Larger medical debts in collections have a reduced impact under current credit scoring models. More importantly, federal rules prohibit providers from sending a disputed No Surprises Act bill to collections while a complaint is under CMS review. File your complaint promptly if you receive a collections threat.
My insurer denied my No Surprises Act claim. What do I do?
File an internal appeal with your insurer. Every health plan is required to have an internal appeals process, and you have the right to request an external review if the internal appeal fails. The external review is conducted by an independent organization and its decision is binding on the insurer. Detailed instructions for both processes should be included in your Explanation of Benefits or your plan's Summary of Benefits and Coverage document.
Does the No Surprises Act protect me if I go out of state for care?
Yes. The No Surprises Act is a federal law that applies uniformly across all states for covered situations. Your state of residence does not affect your federal protections. If you traveled to another state for surgery and received an out-of-network surprise bill, the same federal rules apply.
Disclaimer: The information on this page is provided for educational purposes only and does not constitute medical, legal, or financial advice. BillSurgery is not a licensed medical billing advocate, attorney, or healthcare provider. Results vary based on individual bill complexity and provider response. Replace this disclaimer with lawyer-reviewed language before publishing to general audiences.