What to Do If You're Accidentally Sent to an Out-of-Network Provider

How Surprise Bills Happen

The most common surprise out-of-network bill scenario doesn't involve a patient who made a mistake. It involves a patient who did everything right — chose an in-network hospital, confirmed their surgeon was in-network, scheduled an elective procedure through the proper referral process — and then received a bill months later from a provider they never chose or even knew was involved.

This happens because hospitals use a complex web of provider relationships. Your in-network surgeon may use an anesthesiologist who is not in your network. The radiologist who reads your imaging may be contracted separately and not in-network. An assistant surgeon brought in during a complex procedure may be out-of-network. A hospitalist who visits you during an inpatient stay may not be in your plan. None of these providers were chosen by you — they were assigned by the facility as part of the care team.

Until federal law changed in 2022, patients in many states had little protection from these bills. The provider could bill their full out-of-network rate, the insurer would apply out-of-network cost-sharing, and the patient was responsible for the gap — sometimes thousands of dollars for a single procedure.

📖 Definition: Balance Billing

The practice of a healthcare provider billing a patient for the difference between what the provider charges and what the patient's insurance pays. For in-network providers, balance billing is prohibited — they've agreed to accept the insurer's allowed amount as payment in full. For out-of-network providers, balance billing was historically permitted — until the No Surprises Act limited this practice for specific situations. Source: Centers for Medicare and Medicaid Services.

The No Surprises Act: What It Covers

The No Surprises Act (NSA) took effect on January 1, 2022. It is a federal law that limits how much out-of-network providers can bill patients in specific circumstances — primarily when the patient had no meaningful ability to choose an in-network provider. The law covers:

Emergency care at any facility. If you receive emergency care, you cannot be billed more than your in-network cost-sharing amounts regardless of whether the facility or providers are in-network. This applies to both the facility and the providers who treat you during the emergency.
Non-emergency care at an in-network facility by an out-of-network provider. If you're having a scheduled procedure at an in-network hospital and an out-of-network provider participates in your care without your informed consent, the out-of-network provider cannot balance bill you. You pay only your in-network cost-sharing amount.
Air ambulance services. Out-of-network air ambulance providers cannot balance bill patients beyond their in-network cost-sharing amount.

💡 The NSA Applies to Most Private Insurance Plans

The No Surprises Act applies to most job-based health plans and individual market plans. It does not apply to short-term health plans, health care sharing ministries, or some grandfathered plans. It also does not directly apply to Medicaid or Medicare (which have their own protections). If you're on a standard employer-sponsored or marketplace plan, the NSA almost certainly covers you. Source: CMS No Surprises Act Consumer Information.

What You Actually Owe Under the NSA

When the No Surprises Act applies, your financial obligation is limited to your in-network cost-sharing amount — whatever your plan would charge you for the same type of service from an in-network provider. This means:

Your in-network deductible applies — not a separate out-of-network deductible
Your in-network coinsurance rate applies — not the higher out-of-network rate
Your in-network out-of-pocket maximum applies — amounts paid under NSA protections count toward your in-network out-of-pocket maximum
The out-of-network provider and your insurer negotiate the payment amount between themselves — you are not involved in that dispute and are not responsible for any amount above your in-network cost-sharing

The provider is also required to give you a written explanation of the NSA protections before providing non-emergency care, informing you that you may be receiving out-of-network care and explaining what you'll owe.

When the No Surprises Act Does NOT Apply

The NSA has important gaps — situations where you may still receive an unexpected out-of-network bill with limited protection:

Scheduled care at an out-of-network facility. If you choose to have a procedure at a facility that is not in your network, the NSA does not require the facility or its providers to limit your charges to in-network amounts. The NSA protects you at in-network facilities — not everywhere.
Out-of-network providers you chose. If you requested a specific out-of-network provider — a specialist you specifically asked for, for example — and signed valid consent acknowledging the out-of-network status and estimated costs, the NSA protections don't apply.
Ground ambulance services. Ground ambulance (as distinct from air ambulance) is explicitly excluded from the NSA's balance billing protections. Ground ambulance balance billing is governed by state law, which varies significantly.
Non-covered services. If a service simply isn't covered by your plan at all — not an out-of-network issue but a coverage issue — the NSA doesn't apply.

⚠️ Ground Ambulance Is a Significant Gap

Ground ambulance is one of the most common sources of surprise bills and is explicitly excluded from No Surprises Act protection. Many ambulance services are not in any insurance network, and out-of-network balance billing for ground ambulance remains legal under federal law. State laws vary — some states have their own ground ambulance protections. If you receive a large ground ambulance balance bill, check your state's laws and negotiate with the ambulance provider directly, as many have financial assistance programs. Source: CMS.

The No Surprises Act includes a consent exception: if a patient provides voluntary informed consent acknowledging out-of-network care and the estimated cost, the NSA protections are waived and balance billing is permitted. This consent exception was included in the law to allow patients who specifically want an out-of-network provider for a scheduled procedure to make that choice knowingly.

In practice, some providers have attempted to use consent forms to waive NSA protections from patients who don't understand what they're signing. A pre-operative intake form that includes buried language consenting to out-of-network billing is an attempt to use the consent exception against patients who are not making an informed, voluntary choice of an out-of-network provider.

⚠️ Do Not Sign a Consent to Out-of-Network Billing You Don't Understand

If any provider or facility asks you to sign a consent form waiving your surprise billing protections — particularly for ancillary providers like anesthesiologists, radiologists, or assistant surgeons you did not personally choose — you have the right to refuse. The NSA's consent exception is intended for cases where a patient specifically requests a particular out-of-network provider, not for blanket waivers obtained during pre-procedure paperwork processing. Source: CMS No Surprises Act Consumer Guide.

A Real Surprise Bill Scenario

📋 Paul — In-Network Surgery, Out-of-Network Anesthesiologist

Paul schedules knee surgery at in-network hospitalSurgeon verified in-network

Surgery proceeds — anesthesiologist assigned by hospitalPaul had no involvement in this choice

3 months later: bill from anesthesiology group$2,800 — out-of-network provider

Paul's in-network deductible already metIn-network anesthesia would cost ~$0 (coinsurance met)

No Surprises Act applies — Paul at in-network facility, did not choose providerPaul's liability: in-network cost-sharing only = ~$0

Paul disputes the bill citing NSA protectionsAnesthesia group must bill insurer, not Paul, for the balance

How to Dispute a Surprise Bill Step by Step

Disputing an Out-of-Network Bill Under the No Surprises Act

Verify the situation qualifies under the NSA

Was the facility in-network? Did you have meaningful choice over this provider? Was this emergency care? If the NSA applies, proceed.

Pull your Explanation of Benefits

Get the EOB from your insurer for the date of service. It will show how the claim was processed and what your insurer says you owe.

Call your insurer first

Explain that you received care at an in-network facility from an out-of-network provider you did not choose. Ask how the claim should be processed under the No Surprises Act and request correction if it was processed incorrectly.

Send a written dispute to the provider

Write to the billing department citing the No Surprises Act, explaining you were at an in-network facility and did not select them as a provider, and stating that your liability is limited to in-network cost-sharing under federal law.

File a complaint if unresolved

File a complaint with CMS at the No Surprises Help Desk (1-800-985-3059) or through cms.gov/nosurprises. Also file with your state insurance commissioner. Federal and state agencies have enforcement authority over NSA violations.

How to Protect Yourself Before a Procedure

The most effective surprise bill protection is proactive rather than reactive. Before any scheduled procedure:

Confirm in-network status for every provider who will touch you — the surgeon, the anesthesiologist if you can identify them in advance, the assistant surgeon, and the facility itself. Ask your surgeon's office which anesthesiology group they work with and verify that group's network status with your insurer.
Ask the facility which providers may not be in your network. The facility's patient services or billing department should be able to tell you which provider groups they use that may be out-of-network with your plan.
Request good faith estimates. The No Surprises Act also requires providers to give you a Good Faith Estimate of the expected costs of a scheduled procedure before you have it. You can request this estimate from your provider and use it to compare against any bills you receive later.
Do not sign blanket consent-to-out-of-network-billing forms for providers you did not specifically request and choose.
Know your rights before you need them. Reviewing the CMS consumer guide at cms.gov/nosurprises before a procedure takes five minutes and puts you in a much stronger position if a dispute arises afterward.

🎯 Bottom Line

Surprise out-of-network bills from providers you didn't choose are now limited by federal law in most circumstances. The No Surprises Act caps your liability at your in-network cost-sharing amount when you receive emergency care, when you're at an in-network facility and receive care from an out-of-network provider you didn't select, and for air ambulance services. The law has real gaps — ground ambulance and care at out-of-network facilities are not covered — but for the most common surprise bill scenarios, you have enforceable federal protection. The key is knowing the protection exists, refusing to sign consent forms that waive it, and knowing how to dispute a bill that violates it. Source: Centers for Medicare and Medicaid Services — No Surprises Act.