You went to an in-network hospital, had a procedure, and three months later a bill showed up from an anesthesiologist you never chose and never knew was out of network. That is a surprise medical bill, and as of January 1, 2022, it is illegal under the No Surprises Act. The law gives you concrete rights, concrete steps to fight the bill, and a federal portal to force a resolution. This guide explains exactly what is covered, what is not, and how to file an IDR dispute or a patient complaint in 2026.
Quick Answer: The No Surprises Act bans balance billing for emergency care, out-of-network providers at in-network facilities, and air ambulances. If you get an illegal surprise bill, file a complaint at cms.gov/NoSurprises. If you are uninsured and your bill is $400 or more above your Good Faith Estimate, file through the patient-provider dispute resolution process within 120 days. Upload the bill to the CoveredUSA Bill Analyzer first to spot overcharges and errors before you dispute.
What Is a Surprise Medical Bill?
A surprise medical bill is an unexpected charge from an out-of-network provider when you had no reasonable opportunity to choose an in-network alternative. The most common scenarios:
- You go to an in-network emergency room. The ER doctors, hospitalists, radiologists, or anesthesiologists are out of network. You get a bill for their full out-of-network rate.
- You schedule surgery at an in-network hospital with an in-network surgeon. An out-of-network assistant surgeon or anesthesiology group participates without your knowledge.
- You are airlifted to a hospital and the air ambulance company is out of network.
Before the No Surprises Act, providers could bill you the difference between what your insurer paid and their full billed rate. That practice is called balance billing. The No Surprises Act made balance billing illegal in most of these situations.
What the No Surprises Act Covers (2026)
According to CMS.gov, the law protects people covered by group or individual health plans in three main situations:
| Situation | Protection |
|---|
| Emergency services at any facility | You pay in-network cost-sharing only, regardless of whether the facility or provider is in-network |
| Non-emergency care from out-of-network providers at in-network hospitals, hospital outpatient departments, or ambulatory surgical centers | You pay in-network cost-sharing only (unless you sign a valid consent waiver) |
| Out-of-network air ambulance services | You pay in-network cost-sharing only; providers cannot waive this protection |
Your cost-sharing (copay, coinsurance, deductible) still applies. The law does not make the bill disappear. It caps your liability at whatever you would have paid if the provider were in-network.
What Is NOT Covered
- Ground ambulances. This is the biggest gap. Ground ambulance companies are still legally allowed to balance bill in most states. Congress directed a study on the issue but has not extended federal protections as of 2026.
- Non-emergency care at out-of-network facilities when you voluntarily chose an out-of-network facility and received proper notice.
- Services covered only by grandfathered plans (plans that existed before the ACA and have not made significant changes since).
- Dental, vision, or prescription drug coverage under separate policies.
The Consent Waiver Exception
For non-emergency services from out-of-network providers at in-network facilities, a provider can ask you to sign a consent waiver giving up your balance billing protections. They must give you at least 72 hours notice (or 3 hours if scheduled within 72 hours). You have the right to refuse. For emergency care and air ambulances, consent waivers are never allowed.
The Good Faith Estimate: Your Right as an Uninsured Patient
If you are uninsured (or self-pay), the No Surprises Act gives you a different but equally important protection: the right to a Good Faith Estimate before scheduled care.
Providers must give you a written cost estimate before any scheduled service. The estimate must include all providers expected to be involved in your care. If your final bill is $400 or more above the total on your Good Faith Estimate, you can dispute it through the federal patient-provider dispute resolution process. More on that in the steps below.
Two Separate Dispute Paths: Know Which One Applies to You
This is where many people get confused. There are two completely different federal dispute processes under the No Surprises Act:
| Process | Who Uses It | What It Resolves |
|---|
| IDR (Independent Dispute Resolution) | Providers and health insurance plans (not patients directly) | Payment rate disputes between a provider and an insurer over out-of-network services |
| Patient-Provider Dispute Resolution (PPDR) | Uninsured or self-pay patients | Bills $400+ above the Good Faith Estimate |
| NSA Complaint Portal | Insured patients with balance billing violations | Violations of the No Surprises Act by providers or plans |
If you have insurance and got an illegal balance bill, you file a complaint, not an IDR. The IDR process is a payment arbitration system used by providers and insurers to negotiate rates. Patients are not direct parties to IDR.
Step-by-Step: If You Have Insurance and Got a Balance Bill
Step 1: Confirm the bill violates the No Surprises Act
Check whether the situation fits one of the covered categories: emergency care, out-of-network provider at in-network facility, or air ambulance. Review any consent waivers you signed. If you signed a valid waiver for non-emergency services, the law may not apply.
Step 2: Contact your insurer first
Call the member services number on your insurance card. Tell them you received a balance bill from an out-of-network provider for a covered situation under the No Surprises Act. Ask them to reprocess the claim with in-network cost-sharing applied. Document the call: date, rep name, and case number.
Step 3: Contact the provider's billing department
Tell the billing department you are disputing the balance bill as a violation of the No Surprises Act. Request that they rebill your insurer. Ask them to pause any collections activity while the dispute is open.
Step 4: File a federal complaint
If your insurer and provider cannot or will not resolve the issue, file a complaint at the CMS No Surprises Act complaint portal. You can also call 1-800-985-3059 (available 8 a.m. to 8 p.m. ET, Monday through Friday). State insurance departments also accept complaints and may have faster resolution timelines.
Documents to have ready:
- Explanation of Benefits (EOB) from your insurer
- The actual bill from the provider
- Any consent waivers you signed (or proof you did not sign one)
- Your insurance card and policy number
- Any correspondence with the provider or insurer
Step 5: Contact your state insurance department
Many states have their own surprise billing laws that may offer additional protections or faster resolution. Contact your state insurance commissioner if the federal complaint process stalls.
Step-by-Step: If You Are Uninsured and Got a Bill $400+ Above the Estimate
Step 1: Locate your Good Faith Estimate
You should have received a written estimate before your service. If you did not receive one, the provider may have violated the law. Document this.
Step 2: Compare the bill to the estimate
Add up all charges on the bill. Compare the total to the Good Faith Estimate total. If the difference is $400 or more, you are eligible to dispute.
Step 3: File within 120 days
You must submit your dispute request within 120 calendar days of receiving the bill that is $400 or more above the estimate. Missing this deadline waives your right to dispute that specific bill.
Step 4: Pay the $25 administrative fee
The federal patient-provider dispute resolution process charges a $25 non-refundable fee to initiate. This fee goes to the government, not the provider.
Step 5: Submit through the CMS portal
Visit cms.gov/NoSurprises and navigate to the patient-provider dispute resolution section. You will submit:
- Your Good Faith Estimate
- The bill you received
- Information about the provider
- Your contact information
Step 6: Wait for the determination
An HHS-selected dispute resolution entity reviews the case. During this period, according to CMS guidance, the provider:
- Cannot send the bill to collections
- Must pause collections if it already started
- Cannot charge late fees on the disputed amount
- Cannot take retaliatory action against you for disputing
The determination is binding on both you and the provider.
What Happens in the Provider-vs-Insurer IDR Process
If you are insured and got a covered surprise bill, your insurer is technically supposed to resolve the payment dispute with the provider directly. Here is how that works, because understanding it helps you know why your insurer has leverage:
- The insurer pays an initial amount based on a benchmark rate (the Qualifying Payment Amount, or QPA, typically based on median in-network rates in your area).
- The provider has 30 business days to negotiate directly with the insurer if they disagree with that payment.
- If negotiation fails, either party can initiate IDR within 4 business days of the negotiation period ending by submitting through nsa-idr.cms.gov.
- A certified IDR entity reviews both parties' payment offers and picks one.
- The losing party pays the administrative fee.
Note for 2026: CMS has announced the IDR system will transition to the new IDR Gateway platform in the second half of 2026, centralizing all dispute management in one secure platform. CMS reports show 313,828 disputes were initiated in March 2026 alone, up 18% from February 2026.
As a patient, you are not filing IDR yourself. But understanding the process helps you push your insurer to use it rather than simply passing the cost to you.
How to Check Your Bill for Errors Before You Dispute
Before you go through any dispute process, check the bill itself for errors. Medical billing errors are common. Duplicate charges, upcoded procedures, and services never rendered all show up regularly. The CoveredUSA Bill Analyzer compares each line on your bill to the Medicare rate and flags items that are overpriced or unusual. Catching a coding error or an inflated charge before disputing can save time and strengthen your case.
Upload your hospital bill to the free CoveredUSA Bill Analyzer to find errors, overcharges, and charity care options in 30 seconds.
Common Reasons Patients Lose Disputes
- They signed a consent waiver for non-emergency services and did not realize they gave up their rights.
- The situation is not covered (ground ambulance, out-of-network facility choice, grandfathered plan).
- They missed the 120-day deadline for uninsured patients using the PPDR process.
- The bill is less than $400 above the Good Faith Estimate for uninsured patients (the threshold must be met).
- They did not document anything and cannot prove what happened.
Frequently Asked Questions
What is the difference between a surprise bill and a balance bill?
A balance bill is any bill where the provider charges you the difference between their rate and what your insurer paid. A surprise bill is a type of balance bill that comes from an out-of-network provider you did not knowingly choose. The No Surprises Act makes specific types of balance billing illegal. Not all balance bills are surprise bills under the law, but all surprise bills covered by the Act are forms of balance billing.
Can I dispute a surprise bill if I am covered by Medicaid or Medicare?
Medicaid and Medicare have their own billing rules. The No Surprises Act primarily applies to private group and individual health plans regulated under the ACA. Medicare and Medicaid have separate protections. Contact your plan or 1-800-MEDICARE (1-800-633-4227) if you receive an unexpected bill on a government program.
Does the No Surprises Act apply to ground ambulances?
No. As of 2026, ground ambulances are explicitly excluded from the No Surprises Act's balance billing protections. Air ambulances are covered; ground ambulances are not. This is a known gap that Congress has studied but not yet closed at the federal level. Some states have their own ground ambulance billing protections.
How long does the patient-provider dispute resolution process take?
According to CMS guidance, the selected dispute resolution entity aims to issue a determination within 30 business days of the administrative fee being paid. Complex cases can take longer.
What if the provider sends me to collections while I am disputing?
If you file a valid dispute under the patient-provider dispute resolution process, the provider is legally required to pause or halt collections while the dispute is open. Document when you filed the dispute and keep confirmation. If the provider continues collections in violation of this requirement, include that information in your CMS complaint.
Can a provider refuse to give me a Good Faith Estimate?
No. As of January 2022, providers must give uninsured or self-pay patients a Good Faith Estimate for scheduled services. Failure to provide one is a violation of the No Surprises Act. You can report it to CMS or call 1-800-985-3059.
Does the No Surprises Act help if I cannot afford the bill at all?
The Act limits what you can be charged, but it does not eliminate cost-sharing. If the bill after the Act's protections is still unaffordable, you may qualify for the hospital's charity care program, a payment plan, or a medical debt reduction. The CoveredUSA Bill Analyzer also surfaces charity care eligibility when you upload your bill.
What is the Qualifying Payment Amount (QPA)?
The QPA is the benchmark payment amount insurers use to pay out-of-network providers in surprise billing situations. It is generally based on the median contracted rate for the same service in the same geographic area in 2019, adjusted for inflation. The QPA matters because it sets the baseline that IDR arbiters compare against provider and insurer offers.
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