You went to an in-network hospital. You checked. Weeks later a bill arrives from an anesthesiologist, a radiologist, or an assistant surgeon you never chose and never met — out of network, for hundreds or thousands of dollars.
Since January 1, 2022, that bill has been illegal in most circumstances. The No Surprises Act does not give you a discount to negotiate for. It removes the charge. The problem is that the bill still gets sent, and the law only helps the people who know to say so. Our medical bill dispute tool drafts the letter that says it.
What you’re actually facing
Balance billing is what happens when an out-of-network provider bills you for the difference between what they charged and what your insurer paid. In network, providers agree by contract not to do this. Out of network, they historically could — and the trap was that you often had no way to choose.
You pick the hospital. You do not pick the anesthesiologist assigned to your surgery, the radiologist who reads your scan, the pathologist who examines your sample, or the emergency physician on duty when the ambulance arrives. Any of them can be out of network at a hospital that is in network.
The No Surprises Act is a federal law that took effect January 1, 2022. It applies to most types of health insurance and protects you from unexpected out-of-network bills in three situations:
- Emergency room visits.
- Non-emergency care related to a visit to an in-network hospital, hospital outpatient department, or ambulatory surgical center.
- Air ambulance services.
There is a separate protection for people not using insurance, covered further down.
The practical effect: for covered services, you owe only your normal in-network cost sharing — your deductible, copay, or coinsurance as if the provider had been in network. The provider and the insurer sort out the rest between themselves through a federal dispute process you are not part of. Your obligation stops at the in-network amount.
The law on your side
The No Surprises Act took effect January 1, 2022 and, per CMS, “applies to most types of health insurance.” That “most” matters — it is broad, but not universal, and short-term limited-duration plans and some other arrangements sit outside it.
Emergency care is protected regardless of network status. If you have an emergency, you cannot be balance-billed for the emergency services, and the protection extends through post-stabilization care in defined circumstances.
Non-emergency care at an in-network facility is protected. If the facility is in network, ancillary providers working there generally cannot balance-bill you even if they personally are out of network.
Air ambulance services are covered. Ground ambulances, notably, are not covered by the federal law — a significant and widely misunderstood gap. Some states have their own ground-ambulance protections.
Consent waivers exist, and you should be careful. In certain limited non-emergency situations a provider may ask you to sign a notice-and-consent form waiving these protections. You are not required to sign, and it cannot be required as a condition of treatment for the protected categories. Emergency services and many ancillary services cannot be waived at all. If you signed something at intake without reading it, that is worth investigating — an improperly obtained waiver may not be valid.
If you are uninsured or not using insurance, CMS states that providers “must give you a good faith estimate of what your care will cost” when you schedule in advance or ask for one. If the bill comes in at least $400 more than that estimate, you may be able to dispute it through the patient-provider dispute resolution process. See the eligibility conditions below — they are strict.
Step 1: Work out whether your bill is actually covered
Before disputing anything, establish which category you are in. Get out the bill, the Explanation of Benefits from your insurer, and any paperwork you signed.
Ask, in order:
Was it an emergency? If yes, you are protected regardless of whether the facility or provider was in network.
Was the facility in network? Check your insurer’s directory as of the date of service, not today. If the hospital, hospital outpatient department, or ambulatory surgical center was in network and the billing provider was not, you are very likely protected.
Was it a ground ambulance? Then federal law probably does not help, though your state may.
Did you sign a consent waiver? Find it. Note the date, whether it was presented before or after care, and whether it disclosed a good-faith cost estimate. Waivers presented at the moment of admission, or for services that cannot be waived, are vulnerable.
Are the numbers consistent? Compare the provider’s bill against the insurer’s EOB. If the EOB shows the claim processed at in-network rates and the provider is billing you more than the patient-responsibility line, that gap is the balance bill.
Write down which category you land in, because your letter will need to say it plainly.
Step 2: Do not pay it — and do not ignore it either
Both instincts are wrong.
Do not pay simply to make it stop. Recovering money already paid is much harder than declining to pay something you do not owe. If you have already paid, you can still dispute and request a refund, but the leverage is worse.
Do not ignore it. Unpaid medical bills can be referred to collections, and while medical debt is treated differently than it once was for credit reporting purposes, a collection account creates a whole second problem. Silence also looks like acquiescence.
Instead, respond in writing, quickly, and say specifically that you believe the bill violates federal law. That single sentence changes how a billing department routes your file — it moves from routine collections to compliance.
Also request an itemized bill if you do not have one. You are entitled to know what you are being charged for, and itemization frequently surfaces separate problems: duplicate charges, services never rendered, supplies billed at implausible quantities.
Step 3: Write the dispute letter
Keep it short and put the legal basis in the first paragraph.
Include:
- Your name, account number, date of service, and facility.
- A clear statement that this is a dispute and that you believe the charge violates the No Surprises Act.
- Which protection applies — emergency services, in-network facility, or air ambulance — and the facts establishing it.
- The numbers: what was billed, what the EOB shows, what you have already paid.
- What you want: the balance removed, the account corrected, written confirmation, and no referral to collections while the dispute is open.
- Notice that you will file complaints with CMS and your state regulator if it is not resolved.
Send it to the provider’s billing department and copy your insurer. Certified mail, return receipt requested.
Say nothing about your ability to pay. This is not a hardship request or a negotiation — it is an assertion that the charge is not lawfully owed. Mixing the two weakens both.
If you would rather not assemble the citations yourself, our surprise billing letter generator builds the dispute from your bill and Explanation of Benefits, and shows you the draft before you pay.
Sample dispute letter excerpt
Re: Account No. 77-XXXXXX — Date of Service: March 12, 2026 Facility: Yuma Regional Medical Center
I am disputing the balance of $2,847.00 billed by your practice for services provided on the above date. I believe this charge is prohibited by the federal No Surprises Act.
The services were provided at Yuma Regional Medical Center, which was in network with my plan on the date of service. I did not select your practice and was not given an opportunity to choose an in-network provider. I did not sign a valid notice-and-consent waiver.
My Explanation of Benefits dated April 2, 2026 shows my patient responsibility as $312.00, which I have paid in full. Under the No Surprises Act, my liability is limited to in-network cost sharing.
I request that this balance be removed, that my account be corrected in writing, and that this account not be referred to collections while this dispute is pending.
If this is not resolved, I intend to file complaints with the Centers for Medicare & Medicaid Services and my state insurance regulator.
FightThis drafts the full version from your documents — preview free.
If you are uninsured: the good faith estimate route
This is a separate track with its own rules, and the eligibility conditions are narrow. Per CMS, you can use the patient-provider dispute resolution (PPDR) process only if all of the following are true:
- You did not have or did not use health insurance for the care.
- You told the provider before care that you were not using insurance.
- You received the care on or after January 1, 2022.
- You have a good faith estimate received three days before your scheduled appointment.
- Your initial bill is dated within the last 120 calendar days.
- One provider or facility charged at least $400 more than their good faith estimate.
If you qualify, an independent third party reviews the bill and determines an appropriate payment. Start at CMS’s dispute page.
That 120-day window is the one that catches people. If you are uninsured and holding a bill much larger than your estimate, check the date on it today.
If it doesn’t work
File a complaint with CMS. The No Surprises Help Desk takes complaints about providers, facilities, and insurers that are not following these rules, and the federal government enforces the requirements directly.
File with your state insurance regulator. Many states have their own surprise-billing laws, some broader than the federal one — including, in some states, ground ambulance coverage the federal law lacks.
Push back on your insurer too, not only the provider. If your insurer processed the claim as out-of-network when it should have been treated as in-network cost sharing, that is an insurer problem. If your coverage is through a private employer, the ERISA appeal process applies and gives you a right to the plan’s full claim file.
Watch for collections. If the account is referred while disputed, you gain a second set of rights — send a written dispute to the collector and see our debt validation guide for how that works.
If the bill is not a surprise bill, it may still be wrong. Billing errors, duplicate charges, and charges for services never provided are common, and our guide to fighting medical bills covers the itemized-review approach.
The bottom line
The No Surprises Act is unusual among consumer protections in that it does not ask you to negotiate. For covered services, the balance is simply not yours to pay — your liability stops at in-network cost sharing, and the provider and insurer settle the rest without you.
The bill still arrives, though. Providers send it because most people pay it. Establishing which category you are in takes an afternoon, and the letter that follows is three paragraphs.
This article is general information, not legal advice. Surprise-billing protections depend on your plan type, your state, and the specific circumstances of your care — for large balances, consult a licensed attorney or your state’s consumer assistance program.