The No Surprises Act became effective January 1, 2022, establishing federal protections against surprise medical billing in specific, defined circumstances. Before the law, patients who carefully chose in-network hospitals for planned procedures, or who received emergency care at in-network facilities, could still receive large bills from individual providers at those facilities who were out-of-network. Think anesthesiologists, assistant surgeons, radiologists, and emergency physicians who practice at in-network hospitals but aren’t themselves in every patient’s network. These providers would bill patients directly for amounts far above what the patient’s insurer paid, leaving people with unexpected bills of $8,000, $15,000, or more for care they had no reasonable way to plan around or avoid.
The No Surprises Act targeted this specific problem. It doesn’t eliminate all out-of-network billing or make all healthcare free from surprise costs. It addresses a defined set of situations where patients had no meaningful ability to choose whether they used an out-of-network provider. Understanding exactly what the law covers, what it doesn’t, and how to invoke its protections when you’re facing a potential violation is practical knowledge that can save you thousands of dollars.
Here’s what you need to know.
The Problem the Law Was Designed to Fix
Before diving into what the law covers, it helps to understand the specific situation it was responding to. Imagine you need a knee replacement. You do your research, choose an in-network orthopedic surgeon, confirm the hospital is in-network, and verify your cost-sharing responsibility. You go through the procedure, recovery goes well, and then you get a bill from the anesthesiologist for $12,000. Your insurer paid $800 at the out-of-network rate. The anesthesiologist is billing you for the $11,200 balance. You didn’t choose that anesthesiologist. You didn’t know they were out-of-network. You had no practical way to ensure your surgical team was all in-network because you don’t typically get to handpick your anesthesiologist the way you choose a surgeon.
This scenario was common before 2022. The No Surprises Act ended it for defined categories of care. The anesthesiologist in the scenario above can no longer balance bill you for that $11,200. Your financial responsibility is limited to what it would have been if the anesthesiologist were in-network. The dispute over what the anesthesiologist gets paid above that in-network rate is handled between the anesthesiologist and your insurer through a federal arbitration process, not between the anesthesiologist and you.
What the No Surprises Act Covers
The law’s protections apply in three primary situations. The first is emergency services at any facility, whether it’s in-network or out-of-network. When you have a medical emergency and you’re taken to the nearest emergency department, or you go to an emergency room for an emergency condition, the No Surprises Act requires that you pay no more than your in-network cost-sharing for those emergency services, regardless of whether the facility or the treating providers are in your plan’s network. You’re not responsible for balance billing from an out-of-network emergency room or from any provider treating you there. The financial dispute between the out-of-network provider and your insurer is resolved through a federal Independent Dispute Resolution process that doesn’t involve your wallet beyond your standard cost-sharing.
The second situation is non-emergency services at in-network facilities from out-of-network providers you didn’t have a meaningful choice about. The anesthesiologist scenario above is the classic example. You scheduled a procedure at an in-network facility, and ancillary providers who participated without your choosing them turned out to be out-of-network. Under the No Surprises Act, those providers can’t balance bill you. Your cost-sharing is calculated as if they were in-network. This category covers anesthesiologists, radiologists, pathologists, assistant surgeons, hospitalists, and other providers who typically work at a facility without patients selecting them individually.
The third situation is air ambulance services from companies that participate in the federal Independent Dispute Resolution process. Air ambulances were a significant source of catastrophic surprise bills before the law. Transports that should have been a manageable expense resulted in five and six-figure patient bills after insurance paid what it considered its portion. The No Surprises Act limits air ambulance balance billing to your in-network cost-sharing for participating providers. Note that ground ambulances are not covered under the federal law, though some states have their own ground ambulance billing protections.
What the No Surprises Act Does Not Cover
The law doesn’t cover voluntary out-of-network care. If you choose to see an out-of-network specialist outside of an emergency situation, and you’re not at an in-network facility that directed you to that provider, the No Surprises Act doesn’t apply. You made a choice, and you’re subject to your plan’s out-of-network cost-sharing rules. This is fair. The law is specifically designed for situations where you didn’t have a meaningful choice, not situations where you actively opted for out-of-network care.
There’s also a consent provision worth understanding. If an out-of-network provider wants to balance bill you for a scheduled service that would otherwise be covered by the No Surprises Act, they can do so only if they give you advance written notice, at least 72 hours before the scheduled service in most cases, explaining that they’re out-of-network, what their estimated charge is, and that you have the right to seek care from an in-network provider instead. If you sign the consent form with full understanding, you waive the balance billing protections for that encounter. Read any consent forms carefully before signing. If you see language about out-of-network provider consent or balance billing acknowledgment, ask questions before agreeing and know that you can decline and request an in-network provider instead.
The law doesn’t cover dental and vision care, ground ambulances, services at out-of-network facilities for non-emergency care, or Medicare and Medicaid beneficiaries (who have their own separate balance billing protections). It also doesn’t apply to short-term health insurance plans, which aren’t ACA-compliant, or to some grandfathered health plans. If you have non-ACA-compliant coverage, the No Surprises Act protections may not be available to you, which is one of the less visible risks of those plan types.
Your Rights When You Receive a Suspect Bill
When you receive a bill that appears to violate the No Surprises Act, you have the right to dispute it. Healthcare providers who violate the law’s balance billing prohibitions are subject to civil monetary penalties. The federal government has established a complaint process specifically for patients who believe they’ve received a bill that violates the Act.
To file a federal complaint, go to the CMS No Surprises Help Desk at nosurprises.cms.gov or call 1-800-985-3059. Document the situation thoroughly before you file: the date and facility of your healthcare encounter, the name of the out-of-network provider who billed you, the amount they billed, the amount your insurer paid, what you were asked to pay, and why you believe the No Surprises Act applies. CMS investigates complaints and can take enforcement action against providers who are improperly balance billing patients, including fines of up to $10,000 per violation.
Before filing a complaint, contact your insurer first. Your insurer has a financial stake in the No Surprises Act being correctly applied because the law shifts the balance billing dispute to an arbitration process between the provider and the insurer, not between the provider and you. Your insurer’s member services team can often intervene with the provider directly and resolve the billing dispute faster than a regulatory complaint process. Use both channels if the first one doesn’t resolve the issue quickly.
The Good Faith Estimate Rule
The No Surprises Act also established a separate but related protection called the Good Faith Estimate, which applies to patients who are uninsured or who are paying out-of-pocket rather than using insurance for a scheduled service. If you’re not using insurance for a scheduled procedure or appointment, providers are required to give you a written estimate of expected charges before your care. This estimate must include the costs from all providers involved in your scheduled care, not just the primary provider, and must be provided at least one business day before the service for appointments scheduled fewer than three days out, or at least three business days before for appointments scheduled more than three days out.
If you’re billed more than $400 above the Good Faith Estimate you received, you have the right to dispute the bill through a Patient-Provider Dispute Resolution process administered by HHS. You must initiate this dispute within 120 days of receiving the final bill. The $400 threshold and the 120-day window are the key numbers to remember if you ever use healthcare without insurance and receive a bill that substantially exceeds what you were quoted.
For insured patients, providers are required to provide an Advance Explanation of Benefits for scheduled services upon request, based on the information they have about your plan and benefits. This system gives you a preview of what your care is expected to cost before you receive it, rather than discovering the financial impact afterward. As of 2025, the Advance EOB requirement is still being implemented across the industry, and availability varies significantly by insurer and provider.
State Protections Beyond the Federal Law
Many states have their own surprise billing laws that predate or extend beyond the federal No Surprises Act. California, New York, Texas, Illinois, and other states had state-level protections already in place before 2022, and those laws continue to apply where state law governs. The interaction between federal and state law depends on your plan type. Employer-sponsored health plans governed by ERISA are subject to federal law, not state insurance law, so the No Surprises Act applies and state surprise billing laws generally don’t. For fully insured employer plans and individual market plans regulated by the state, state laws may provide additional protections beyond the federal baseline.
If you believe your situation involves state-level surprise billing protections, contact your state insurance department. They can tell you which state-level rules apply to your plan type and your situation, and they can receive and investigate complaints about violations. Some state protections are broader than federal law in ways that matter, particularly around ground ambulances and certain non-emergency out-of-network situations. Knowing both the federal and state frameworks that apply to you gives you the most complete picture of your rights.
The Independent Dispute Resolution Process
When an out-of-network provider and your insurer disagree about what the provider should be paid for covered services under the No Surprises Act, they resolve that dispute through federal Independent Dispute Resolution, or IDR. This process is a baseball-style arbitration where both sides submit their proposed payment amount and an arbitrator selects one. The criteria the arbitrator uses favor the insurer’s in-network median rate as a baseline, though providers can submit evidence about the complexity of care, the provider’s training and experience, and other factors that might justify a higher payment.
You’re not a party to the IDR process and you don’t pay for it, though the healthcare system’s overall costs are affected by its outcomes over time. What matters to you directly is that the IDR process determines what the out-of-network provider receives, not what you pay. Your cost-sharing is fixed at the in-network rate regardless of how the arbitration concludes. If the arbitrator awards the out-of-network provider a payment above the in-network rate, your insurer pays the difference, not you.
Practical Steps When You Think the Law Applies
When you receive a bill from an out-of-network provider and you believe the No Surprises Act should have applied to your situation, work through these steps in order. First, pull your EOB for the corresponding encounter and confirm what your insurer paid and what they’re showing as your responsibility. Second, call the out-of-network provider’s billing department, explain why you believe the No Surprises Act applies, and ask them to review the bill and limit your responsibility to your in-network cost-sharing amount. Third, if the provider billing department disputes your position, call your insurer and ask them to intervene and explain the applicable protections to the provider. Fourth, if direct resolution fails, file a complaint with the CMS No Surprises Help Desk and your state insurance department.
Document everything throughout this process. Dates of calls, names of representatives, reference numbers, what was said, what was promised, and what happened next. This documentation supports your complaint filing if you need it, and it also gives you a clear record if the bill proceeds to collections while in dispute. A billing error or a balance billing violation doesn’t become your legal obligation just because the provider is persistent about collecting it. Know your rights, use your documentation, and escalate until the issue is resolved correctly.