Washington State Balance Billing Laws and Protections

Under the Washington state balance billing law, an out-of-network provider cannot charge you more than your in-network cost-sharing for emergency care, scheduled care delivered by an out-of-network provider at an in-network facility, air ambulance transport, and (for plans issued or renewed on or after January 1, 2025) ground ambulance transport. If you already paid too much, the provider has 30 business days to refund the excess before 12 percent annual interest kicks in.¹

Which Bills the Law Protects You From

The Balance Billing Protection Act (RCW 48.49) covers four situations where a surprise out-of-network charge is most likely to land on a patient.

Emergency services at any hospital or freestanding emergency department are protected regardless of network status. You should not receive a balance bill for emergency room care in Washington.¹

Nonemergency services performed by an out-of-network provider at an in-network facility are also protected. This is the situation that catches most people: you schedule surgery at a hospital your plan covers, but the anesthesiologist or radiologist isn’t in your network. You owe only your normal in-network copayment or coinsurance. The statute reaches anesthesiology, pathology, radiology, neonatology, diagnostic lab work, imaging, assistant surgeons, hospitalists, intensivists, and other specialties the insurance commissioner designates.²

Air ambulance services are fully protected. If you’re airlifted by an out-of-network helicopter company, that company settles the difference with your insurer directly and can bill you only your in-network cost-sharing.¹

Out-of-network behavioral health emergency providers are covered on the same terms as medical emergency providers.³

Ground Ambulances Are Now Covered Too

For health plans issued or renewed on or after January 1, 2025, out-of-network ground ambulance companies cannot balance bill you either. You pay your in-network cost-sharing amount and nothing more. This matters because the federal No Surprises Act does not protect ground ambulance patients, and many states leave the gap open. Washington closed it. The same 30-business-day refund rule and 12 percent interest penalty apply if a ground ambulance company overcharges you.⁴

Which Health Plans Are Covered

The law applies to all state-regulated health plans. That includes individual policies purchased directly from an insurer, plans bought through the Washington Health Benefit Exchange, small-group employer plans, and Public Employees Benefits Board (PEBB) and School Employees Benefits Board (SEBB) plans, whether HMO or PPO.⁵

Self-funded employer plans are the main exception. Those plans are governed by federal ERISA rules, so Washington’s law doesn’t automatically apply, though a self-funded plan can voluntarily opt in and many large employers do.⁶

If your employer’s plan hasn’t opted in, you still have the federal No Surprises Act, which covers emergency services, out-of-network care at in-network facilities, and air ambulances on similar terms. Federal law does not cover ground ambulances the way Washington’s law does.⁷

Not sure which category your plan falls into? Check your insurance card or benefits documents for a reference to the Washington Office of the Insurance Commissioner (OIC), or call the OIC’s consumer advocacy line at 800-562-6900.

What You Actually Owe, and How Refunds Work

For a protected service, your obligation is satisfied when you pay the in-network cost-sharing amount specified in your plan. Standard copayment, coinsurance, or deductible applies exactly as if the provider had been in-network. Your insurer calculates this using the qualifying payment amount methodology and sends you an explanation of benefits.³

Those payments must also count toward your in-network deductible and out-of-pocket maximum. That prevents the common trap where out-of-network spending doesn’t chip away at your annual cap.³

Already paid too much? The provider has 30 business days from receiving your payment to refund the excess. If the refund doesn’t arrive on time, the provider owes you 12 percent annual interest starting the day after that deadline. The rule applies to hospitals, air ambulance companies, ground ambulance organizations, and behavioral health emergency providers on the same terms.¹

No One Can Ask You to Sign Your Protections Away

No provider, hospital, ambulatory surgical facility, behavioral health emergency provider, air ambulance company, or ground ambulance organization may ask you to sign anything waiving or altering your balance billing protections. The ban covers oral agreements, written forms, and electronic signatures.¹

This goes further than the federal No Surprises Act, which lets some out-of-network providers get a patient’s written consent to waive protections for certain nonemergency, non-ancillary services at in-network facilities. Washington has no such exception. If a provider hands you a form making you responsible for charges beyond your in-network cost-sharing, you can refuse to sign, and the form has no legal force in Washington even if you do sign it. Report the request to the OIC.⁸

What to Do If You Get a Surprise Bill

Start with the provider’s billing office. Tell them you believe the bill violates the Balance Billing Protection Act and ask them to correct it. Sometimes this is a billing-department error and gets fixed on the first call.⁹

If that doesn’t resolve it, file a complaint with the Office of the Insurance Commissioner. Gather these documents first:

Your explanation of benefits (EOB) from the insurer.
The itemized bill from the provider, with procedure codes and charges.
Your insurance member ID card, which shows your group number and plan type.
Dates of service and the names of every provider involved in the disputed claim.

You can submit the OIC’s provider complaint form, file through the online complaint portal, or call 800-562-6900. The OIC forwards the complaint to both the provider and the insurance company and requires each to explain their actions. If you don’t include documentation upfront, the OIC has to send the complaint to the insurer first to verify how the claim was processed, which can add up to 60 days.¹⁰

Keep a log of every phone call and email with the billing department and the insurer. Those records show you tried to resolve the issue before going to the state and give the OIC investigator a clearer picture of what happened.

One more thing worth knowing: when a provider and insurer disagree about the payment rate, they resolve it through an independent dispute resolution process that runs between them. You don’t attend, you don’t pay for it, and your cost-sharing doesn’t change based on the outcome. If a provider tries to collect a disputed amount from you while that arbitration is pending, that’s worth reporting to the OIC.¹¹

If You’re Uninsured or Paying Out of Pocket

The Balance Billing Protection Act applies to people with qualifying health insurance. If you’re uninsured or self-pay, you fall under a different federal rule instead: the good faith estimate requirement in the No Surprises Act.

Before any scheduled service, the provider or facility must give you a written good faith estimate of expected charges. If the final bill exceeds that estimate by $400 or more (measured against the total, not individual line items), you can dispute the excess through the federal Patient-Provider Dispute Resolution process. You have 120 calendar days from receiving the bill to file. The filing fee is $25, waived for financial hardship and refunded if you win, and the arbitrator’s decision is binding on the provider.¹²

If you’re scheduling care as a self-pay patient, ask for the good faith estimate in writing and keep it with your other billing records.

1
Washington State Legislature. Washington Code RCW 48.49.020 – Balance Billing Prohibition
2
Washington State Legislature. Washington Code RCW 48.49 – Balance Billing Protection Act
3
Washington State Legislature. Washington Code RCW 48.49.030 – Enrollee Cost-Sharing Obligations
4
Washington State Legislature. Washington Code RCW 48.49.200 – Ground Ambulance Services
5
Managed Care Contracting. Washington Code RCW 48.49 – Balance Billing Protection Act
6
Office of the Insurance Commissioner. Self-Funded Group Health Plans and Surprise Billing
7
U.S. Department of Labor. Avoid Surprise Healthcare Expenses – How the No Surprises Act Can Protect You
8
Washington State Legislature. Washington Code RCW 48.49 – Balance Billing Protection Act, Full Chapter
9
Office of the Insurance Commissioner. What Consumers Need to Know About Surprise or Balance Billing
10
Washington State Office of the Insurance Commissioner. Provider Complaint Form
11
Centers for Medicare & Medicaid Services. About Independent Dispute Resolution
12
Centers for Medicare & Medicaid Services. Overview of Rules and Fact Sheets