You scheduled a procedure at an in-network hospital, used an in-network surgeon, and still received a bill for thousands of dollars from an out-of-network anesthesiologist you never chose. Before January 1, 2022, that bill was largely your problem. The No Surprises Act changed that — and if you understand exactly how it works, you can use it to eliminate or dramatically reduce unexpected medical charges.

What Is the No Surprises Act and Who Does It Protect?

The No Surprises Act (NSA) is a federal law that took effect January 1, 2022, as part of the Consolidated Appropriations Act of 2021. It protects patients enrolled in most private health insurance plans — including employer-sponsored plans, individual and family plans purchased through the marketplace, and grandfathered plans — from receiving surprise bills in specific circumstances.

The law covers two primary situations:

  • Emergency care: Any emergency services rendered at any hospital or freestanding emergency department, regardless of whether the facility or provider is in-network.
  • Non-emergency care at in-network facilities: Services provided by out-of-network providers at a facility you chose specifically because it was in-network — such as an out-of-network assistant surgeon, radiologist, anesthesiologist, or pathologist.

The NSA does not cover Medicaid, Medicare (which has its own protections), TRICARE, Veterans Affairs coverage, or most short-term health plans. It also does not apply to situations where you knowingly and voluntarily agreed in writing to see an out-of-network provider and waived your protections — more on that below.

How Does the No Surprises Act Limit What You Can Be Charged?

Under the NSA, when the law applies, your cost-sharing — meaning your copay, coinsurance, and deductible — must be calculated as if the out-of-network provider were in-network. The provider cannot bill you for the difference between their full charge and what your insurer paid. That practice, known as balance billing, is banned in the circumstances the law covers.

Here's what that looks like in practice: If your in-network cost-sharing for anesthesiology is a $200 copay, and an out-of-network anesthesiologist provided services during your covered procedure, you owe $200 — not the $2,400 the anesthesiologist billed. The dispute over the remaining amount is settled between the provider and your insurer through a process called the Independent Dispute Resolution (IDR) process. You are removed from the middle entirely.

The law also caps out-of-pocket costs for emergency services at in-network cost-sharing levels, even when you are treated at an out-of-network emergency room. Your plan's in-network emergency copay or coinsurance applies.

What Is the Consent and Waiver Exception — and Why It Matters?

The NSA includes one significant exception that providers sometimes use improperly: the voluntary consent and waiver provision. Under this exception, a patient can agree in writing to waive their NSA protections for certain non-emergency, non-ancillary services from an out-of-network provider. If you sign this waiver, the provider can balance-bill you.

The requirements for a valid waiver are strict:

  1. The waiver must be presented at least 72 hours before the scheduled service (or 3 hours before if scheduled same-day).
  2. You must receive a good faith cost estimate from the out-of-network provider at the time you sign.
  3. The waiver must be provided as a standalone document — it cannot be buried in general hospital admission paperwork.
  4. The provider must inform you that in-network alternatives are available.
  5. The waiver is not permitted for ancillary providers — including anesthesiologists, radiologists, pathologists, neonatologists, assistant surgeons, and hospitalists. These providers cannot ask you to waive your rights, period.

If a provider handed you a stack of admission forms and you signed something that looks like a waiver, that waiver is likely invalid. Review any paperwork you signed and look for language about out-of-network consent. If it was embedded in general forms, if you were not given a good faith estimate, or if it covered an ancillary provider, you have grounds to dispute the bill.

What Are Your Rights Under the Good Faith Estimate Rule?

The NSA also created the Good Faith Estimate (GFE) requirement. If you are uninsured or self-pay, any provider or facility scheduling a service must give you a written GFE of expected charges before your appointment — at least 3 business days before a scheduled service, or 1 business day for services scheduled with less lead time.

For insured patients, the law requires that providers give GFEs to insurers for coordinating expected charges. If your final bill exceeds the GFE you received as an uninsured or self-pay patient by more than $400, you have the right to dispute it through the Patient-Provider Dispute Resolution (PPDR) process administered by the federal government.

To initiate a PPDR dispute:

  1. Request a dispute through the federal portal at cms.gov within 120 days of receiving the bill.
  2. Pay a $25 administrative fee (refundable if you win).
  3. Submit your GFE and the itemized bill showing the discrepancy.
  4. A Selected Dispute Resolution entity reviews both sides and determines a binding payment amount.

How Do You Actually Use the No Surprises Act to Fight a Bill?

Knowing your rights is step one. Enforcing them is step two. Here's how to act when you receive a surprise bill that may violate the NSA:

  1. Pull your Explanation of Benefits (EOB). Log into your insurer's portal and download the EOB for the date of service. Confirm whether the claim was processed as in-network or out-of-network, and what your plan paid versus what you are being billed.
  2. Identify the provider type. Was the surprise bill from an anesthesiologist, radiologist, pathologist, or other ancillary provider? If yes, NSA protections almost certainly apply regardless of any paperwork you signed.
  3. Contact your insurer first. Call the member services number on your insurance card and state explicitly: "I believe this bill violates the No Surprises Act. I am requesting that this claim be reprocessed at in-network cost-sharing levels." Document the date, time, and name of the representative.
  4. File a complaint with your state insurance commissioner if your insurer does not respond appropriately. Many states have their own surprise billing laws that may offer additional protections.
  5. File a federal complaint. If your plan is self-funded (common with large employers) or if state regulators don't have jurisdiction, file a complaint with the Centers for Medicare & Medicaid Services (CMS) at cms.gov/nosurprises or by calling 1-800-985-3059.
  6. Send a certified letter to the billing provider. Put them on notice in writing that you believe the bill violates the NSA, that you are disputing it, and that you are filing complaints with the appropriate agencies. Certified mail creates a paper trail.

What Are Common Ways Providers Violate the No Surprises Act?

Understanding where violations most frequently occur helps you spot them quickly:

  • Anesthesiology balance billing: The most common NSA violation. Anesthesiologists who are out-of-network at an in-network facility bill the full amount and expect the patient to pay the difference.
  • Emergency department facility fees: Out-of-network ER facilities charge patients as if they were uninsured rather than applying the in-network cost-sharing structure required by the NSA.
  • Invalid waivers in admission packets: Providers include out-of-network consent language inside standard intake paperwork and then assert the patient waived their rights.
  • Air ambulance billing: The NSA extended surprise billing protections to most air ambulance services provided by private carriers. Many patients are still being incorrectly balance-billed after air transport.
  • Post-discharge collection attempts: A provider or collection agency pursues payment after the insurer has already adjudicated the claim at the capped amount, hoping the patient doesn't know the correct balance owed.

Frequently Asked Questions

No — ground ambulance services are explicitly excluded from the No Surprises Act's surprise billing protections. This is one of the most significant gaps in the law, and ground ambulance balance billing remains a major source of unexpected medical debt. Some states have enacted their own ground ambulance billing protections, so check with your state insurance commissioner for local rules.

Providers and facilities covered by the NSA are prohibited from taking adverse collection actions — including sending a bill to collections or reporting it to credit bureaus — while a valid dispute is pending. If you have filed a complaint with CMS or initiated a dispute resolution process, document everything and notify the billing provider in writing that a dispute is active. If they proceed with collections anyway, include that violation in your CMS complaint.

The No Surprises Act applies to nearly all employer-sponsored group health plans, including self-funded plans regulated under ERISA — your employer cannot opt out of it. If your plan administrator is claiming exemption, request that claim in writing and file a complaint with the Employee Benefits Security Administration (EBSA) at the Department of Labor, which has enforcement authority over employer-sponsored plans.

For the Patient-Provider Dispute Resolution process (for uninsured or self-pay patients disputing a bill that exceeds the Good Faith Estimate by more than $400), you have 120 days from the date you receive the bill to initiate a dispute through the CMS portal. For insured patients disputing balance billing violations, timelines vary depending on your insurer's appeals process and your state's complaint procedures, but acting within 60 to 90 days of receiving the bill is strongly advised.

The NSA covers out-of-network emergency facility fees — meaning if you are treated at an out-of-network emergency room, your cost-sharing must be calculated at your plan's in-network emergency rate. However, for non-emergency services, the facility itself must be in-network for NSA protections to apply to ancillary provider bills. If both the facility and the provider are out-of-network and you scheduled care there knowingly, the NSA generally does not apply to the facility fee.