What Is Balance Billing?

Balance billing happens when out-of-network providers bill you for the difference between their charges and what your insurance paid. Learn your rights and protections.

What Is Balance Billing?

You chose an in-network hospital. You confirmed it was covered. You did everything right. Then, weeks after your procedure, a bill arrives from an anesthesiologist you never chose — for $3,400 above what your insurance paid. That is balance billing, and it catches patients off guard more often than any other surprise in medical billing.

Balance billing occurs when a healthcare provider charges you the difference between their full billed amount and what your insurance company paid — even when you had no realistic way to choose that provider or avoid the charge.

Here is the basic math: a provider charges $3,000 for a procedure. Your insurer pays $800 based on an out-of-network rate. The provider then sends you a bill for the remaining $2,200. That $2,200 bill is the “balance.”

For in-network providers, balance billing is generally prohibited under the terms of their contract with your insurer. For out-of-network providers, it has historically been common — and often financially devastating for patients.

When Balance Billing Typically Occurs

Balance billing most often happens in situations where patients had little or no control over which provider they saw:

  • Emergency care: You are rushed to the nearest hospital, which may be out of network
  • Facility-based care: You chose an in-network hospital but were treated by an out-of-network anesthesiologist, radiologist, or surgeon who was on call
  • Air ambulance transport: Ground and air ambulance services are frequently out of network
  • Surprise specialist consultations: A specialist is called in during a procedure without your prior knowledge or consent

These scenarios are so common they led Congress to pass the No Surprises Act in 2020.

The No Surprises Act: Federal Protections Since 2022

The federal No Surprises Act took effect on January 1, 2022 and dramatically changed the landscape of balance billing for many patients.

Under this law, for most types of insurance:

  • Emergency services from any provider — in or out of network — cannot result in balance billing beyond in-network cost-sharing amounts
  • Non-emergency services at in-network facilities by out-of-network providers require your advance written consent before you can be balance billed
  • Air ambulance services from out-of-network providers are limited under separate provisions

The law applies to most private health insurance plans, including those offered through employers and the individual market. Medicare and Medicaid have their own separate protections.

For a full overview, see our guide on the No Surprises Act, which also covers how to file a complaint if your rights are violated.

What the No Surprises Act Does Not Cover

The law has important gaps:

  • Ground ambulance services are not fully covered under the Act (as of 2024, this remains a policy gap)
  • Patients who sign a consent form knowingly waiving their rights for non-emergency out-of-network care at in-network facilities
  • Self-pay patients (uninsured individuals have separate rights under the law, including good faith cost estimates)
  • Grandfathered health plans that existed before the ACA may not be covered

How to Recognize a Wrongful Balance Bill

If you receive a bill that looks like balance billing, ask these questions:

  1. Was this an emergency? If yes, you likely have full federal protection under the No Surprises Act.
  2. Was this at an in-network facility? If so, ask whether the out-of-network provider was required to notify you and get your written consent before billing you the balance.
  3. Did you sign an advance notice waiving your balance billing protections? If not, you may not owe the balance.
  4. Does your state have additional protections? Many states have laws that go beyond federal protections.

Use our EOB decoder to understand how your insurer processed the claim and whether the out-of-network charges were applied correctly.

Steps to Take If You Are Balance Billed

Step 1: Do not pay the balance immediately. This is especially true for emergency care or care at an in-network facility. Paying before disputing may waive your rights.

Step 2: Request an itemized bill and your EOB. Compare what the provider billed to what your insurer paid and what your plan says you owe.

Step 3: Contact your insurer. Ask whether the No Surprises Act or your state’s balance billing law applies to this claim. Your insurer may have already negotiated a lower rate that reduces or eliminates the balance.

Step 4: File a dispute. Use our dispute letter tool to create a formal written dispute to the provider and your insurer. Reference the specific federal or state law that protects you.

Step 5: File a complaint. If the provider refuses to correct an unlawful balance bill, file a complaint with:

  • The federal No Surprises Act help desk (call 1-800-985-3059 or visit cms.gov/nosurprises)
  • Your state insurance department
  • Your state attorney general’s consumer protection office

Balance Billing vs. Your Deductible

It is important to distinguish balance billing from legitimate cost-sharing. Your deductible, copay, and coinsurance are part of your plan design — you agreed to those amounts when you enrolled. Balance billing is different: it is the provider seeking more than what your plan says you owe. If your EOB shows your total responsibility as $200 and the provider bills you $1,500, that $1,300 gap deserves scrutiny.

FAQ

Q: Is balance billing legal? A: It depends. Balance billing by in-network providers is generally prohibited by their contracts. Balance billing for emergency care or by out-of-network providers at in-network facilities is prohibited under the No Surprises Act for most covered patients. Balance billing in other situations may be legal depending on your state and plan type.

Q: Can I negotiate a balance bill? A: Yes. Even when balance billing is technically legal, providers will often negotiate — especially if you explain financial hardship or offer to pay promptly. Do not assume the stated balance is the final word.

Q: What if my state has stronger protections than the federal law? A: State laws that provide greater protections than the No Surprises Act continue to apply in those states. The federal law sets a floor, not a ceiling.

Q: Does the No Surprises Act apply to Medicare? A: Medicare has separate and long-standing protections against balance billing. Medicare-participating providers must accept Medicare’s approved amount as payment in full. The No Surprises Act is primarily targeted at private insurance markets.

Q: What is a Good Faith Estimate? A: Under the No Surprises Act, uninsured or self-pay patients can request a Good Faith Estimate from providers before scheduled services. This written estimate must list all expected charges. If the final bill exceeds the estimate by more than $400, patients can use a dispute resolution process.