The No Surprises Act is a federal law that protects you from unexpected medical bills when you receive care from out-of-network providers in situations you can’t control. It took effect on January 1, 2022, and applies to most people with private health insurance. The core idea is straightforward: if you go to an in-network hospital but get treated by a doctor who isn’t in your network, or you end up in an emergency room with no ability to choose your provider, you shouldn’t be stuck with a massive bill for the difference between what your insurer pays and what the provider charges.
Which Services Are Protected
The law covers three main categories of care. The first is emergency services, including emergency mental health treatment, whether you’re seen in a hospital emergency department or a freestanding emergency center. Protection extends to care you receive after you’ve been stabilized, even if you’re moved to a different department within the hospital. This matters because post-stabilization care is where many surprise bills used to originate.
The second category is non-emergency care from out-of-network providers at in-network facilities. This is the classic surprise billing scenario: you schedule a surgery at an in-network hospital, but the anesthesiologist, radiologist, or pathologist who treats you happens to be out of network. Under the law, hospitals, hospital outpatient departments, and ambulatory surgical centers are all covered. Specific services that are always protected (and can’t be waived) include anesthesiology, radiology, pathology, neonatology, diagnostic labs, assistant surgeons, hospitalists, and intensivists.
The third category is air ambulance services from out-of-network providers. Ground ambulances, however, are not covered. If you’re transported by a ground ambulance that’s out of network, the No Surprises Act places no restrictions on what the provider can bill you.
How Your Costs Are Calculated
When the law applies, your out-of-pocket responsibility is based on in-network rates, not whatever the out-of-network provider decides to charge. In states without their own surprise billing laws (or where state law doesn’t cover your specific situation), your cost sharing is calculated using the lower of two numbers: the amount the provider actually billed, or the Qualified Payment Amount. The QPA is generally the median of the rates your insurance plan has negotiated with in-network providers for that same service in your geographic area.
This means your copay, coinsurance, or deductible is calculated as if the provider were in network. The out-of-network provider and your insurer work out the rest between themselves. Any amount you pay counts toward your in-network deductible and out-of-pocket maximum.
Good Faith Estimates for Uninsured Patients
If you don’t have insurance or choose to pay out of pocket, the law gives you the right to receive a Good Faith Estimate of expected charges before your care. Providers must deliver this estimate on specific timelines: within one business day if you schedule at least three business days ahead, or within three business days if you schedule 10 or more days in advance. You can also request an estimate at any time, and the provider has three business days to respond.
The estimate must include an itemized list of every service you’re expected to need, grouped by provider or facility, along with expected charges for each item. It should list all providers involved by name and location, any services that would need to be scheduled separately, and clear disclaimers that the estimate is not a final bill and that additional services may be recommended later.
If your final bill exceeds the Good Faith Estimate by $400 or more, you have the right to dispute it through a patient-provider dispute resolution process. This gives the estimate real teeth, because providers know that inflating a bill well beyond the estimate will trigger a formal review.
How Providers and Insurers Resolve Payment Disputes
When an out-of-network provider and an insurer can’t agree on payment, the law creates a structured path to resolution. First, both sides enter a 30-business-day open negotiation period to try to reach an agreement on their own. If that fails, either party has four business days to initiate the federal Independent Dispute Resolution (IDR) process.
The IDR process uses “baseball-style” arbitration: both sides submit a final payment offer to a neutral, certified arbitrator, and the arbitrator must pick one offer or the other. There’s no splitting the difference. Both parties are bound by the decision, and payment must be made within 30 calendar days. This system is designed to encourage reasonable offers from both sides, since an extreme number is likely to lose.
The IDR process has become contentious. Insurers have filed lawsuits in more than a dozen states, alleging that some providers and third-party firms have flooded the system with disputes to overwhelm it and extract higher payments. Federal courts in California and Florida dismissed early insurer lawsuits in April 2026, finding that the law bars judicial review of IDR outcomes. Multiple cases remain pending across the country, and a federal appeals court is expected to hear arguments in a related case in mid-2026.
When Providers Can Ask You to Waive Protections
In limited, non-emergency situations, an out-of-network provider at an in-network facility can ask you to waive your surprise billing protections by signing a notice and consent form. This is only allowed for scheduled, non-emergency services, and it can never be used for ancillary services like anesthesiology, radiology, pathology, or emergency care. If your appointment is made at least 72 hours in advance, you must receive the notice at least 72 hours before care. For shorter-notice appointments, the form must be provided on the day of scheduling, and no later than three hours before the service.
These forms cannot be given to uninsured patients, Medicare or Medicaid beneficiaries, or anyone seeing only in-network providers. If you’re presented with a waiver form, you have the right to refuse to sign it, and the provider must still treat you under the law’s protections, though they may refer you to an in-network alternative.
How Federal and State Laws Work Together
Many states had their own surprise billing laws before the federal act took effect. The No Surprises Act supplements these state laws rather than replacing them. When a state law applies to your type of insurance, your provider, and the specific service you received, and it offers at least the same level of protection, the state law generally takes priority. If the state law doesn’t cover your situation, or only covers part of it, federal protections fill the gaps.
This can play out in practical ways during a single visit. A state law might cover your labor and delivery services but not the neonatologist who treats your newborn. In that case, state law governs the delivery charges and federal law governs the neonatology charges. State laws also sometimes define emergency services differently. Many don’t include post-stabilization care, so the federal law’s broader definition kicks in for those services even in states with their own protections.
Filing a Complaint
If you believe a provider or insurer has violated the No Surprises Act, you can file a complaint through the CMS portal at cms.gov/medical-bill-rights/help/submit-a-complaint, or call the federal help desk at 1-800-985-3059. The help desk can also walk you through your options if you’re unsure whether the law applies to your specific bill.