Glossary
Balance Billing
When an out-of-network healthcare provider bills you for the difference between what they charge and what your insurance pays. Largely banned for emergency care and most out-of-network care at in-network facilities under the federal No Surprises Act, which took effect January 1, 2022.
Last updated: May 19, 2026
Balance billing happens when an out-of-network healthcare provider bills you for the difference between their billed charge and what your insurance company pays. Before federal protection arrived, balance bills could arrive months after an emergency room visit, sometimes for thousands of dollars from providers the patient never knowingly chose. Today the practice is largely banned in specific situations, but the rules have edges worth knowing.
How a balance bill happens
Insurance contracts include a negotiated rate for in-network providers. When you see an out-of-network provider, no contract exists, and the provider can charge their full “list” price. Insurance still pays its out-of-network rate (often a fraction of the bill), and the provider sends you a separate invoice for the gap.
A common pre-2022 scenario: a patient went to an in-network hospital for surgery. The surgeon was in-network. The anesthesiologist, who the patient never met or chose, was out-of-network. The anesthesiologist sent a $2,800 balance bill two months later.
What the No Surprises Act changed (effective January 1, 2022)
The federal No Surprises Act, signed December 27, 2020 and effective January 1, 2022, bans balance billing in three big situations:
- Emergency care, whether you go to an in-network or out-of-network ER. You only pay your in-network cost-share.
- Out-of-network ancillary providers at in-network facilities: anesthesiologists, radiologists, pathologists, assistant surgeons, hospitalists, intensivists, and emergency physicians can no longer surprise you with a separate bill.
- Air ambulance services, including private/non-government air ambulances.
In all three cases, your cost-sharing (your deductible, coinsurance, copay) is calculated as if the provider were in-network. The provider and insurer fight it out behind the scenes through the Independent Dispute Resolution (IDR) process for billed amounts above $400.
What is still allowed
The No Surprises Act does not cover every situation:
- Non-emergency out-of-network care you chose knowingly: if you pick an out-of-network specialist for a planned procedure and sign a consent form acknowledging the cost, balance billing is still legal.
- Ground ambulance services: not yet covered by the federal law as of 2026 (some states have their own bans).
- Providers outside the law: dental, vision standalone plans, and certain non-licensed practitioners.
Independent Dispute Resolution (IDR)
When a balance bill is disputed under the No Surprises Act, the provider and insurer enter the federal IDR process. They each submit an offer, and a certified arbitrator picks one. The process is invisible to you in most cases. If you receive a bill you believe violates the No Surprises Act, you can call the federal help line (1-800-985-3059) or file a complaint at CMS.gov.
Practical impact for Hispanic patients
Balance bills disproportionately hurt patients who face linguistic or administrative barriers when disputing charges. If you receive a bill in English that you do not understand, do not pay it before checking whether it should be blocked by the No Surprises Act. Ask the provider for a written itemized bill, and call a licensed agent or the federal help line if anything looks like a surprise charge.
Related terms
If you received an unexpected medical bill, contact us and we will help you figure out whether the No Surprises Act applies.