The federal No Surprises Act protects you from most surprise bills at surgery centers, but the protection has limits—and ground ambulances fall through a major gap that only some states have sealed. Federal law bars out-of-network providers from balance billing you when you receive emergency care or specified support services (anesthesia, radiology, pathology, lab work) at an in-network facility, capping your cost at the in-network rate.
However, ground ambulances are not covered by federal law, leaving you vulnerable to balance bills in most states unless your state has passed its own protections. Understanding both what the law covers and where it stops is the difference between knowing your rights and facing an unexpected five-figure bill. This article walks you through federal protections, identifies the coverage gaps, explains how states are plugging them, and tells you what to do if you receive a balance bill you believe violates the law.
Table of Contents
- What Federal Law Protects You From
- The Federal Protections You Cannot Be Forced to Waive
- The Ambulance Gap—Where Federal Law Leaves You Exposed
- What to Do If You Receive a Balance Bill
- Understanding the "Non-Ancillary" Gap
- Frequently Asked Questions
What Federal Law Protects You From
The No Surprises Act, which became fully effective January 1, 2022, stops out-of-network providers from sending you a separate bill at an in-network surgery center when you receive emergency care. Your cost is capped at whatever your health plan would charge you in-network, preventing the two-tier bill that used to happen when an emergency surgeon or anesthesiologist was not contracted with your insurance.
The law also protects you for eight categories of ancillary services—the support work that happens alongside your main procedure. Anesthesia, pathology, radiology, laboratory, neonatology, assistant surgeon, hospitalist, and intensivist services cannot result in balance bills from out-of-network providers when delivered at an in-network facility, regardless of whether your procedure was an emergency.
These protections apply even if the facility used an out-of-network specialist you did not choose and could not have known about in advance. The law's scope is narrower than many patients assume: it applies to in-network facilities, meaning your surgery center, hospital, or outpatient clinic is under contract with your plan. If you choose an out-of-network facility, the protections do not follow you there.
The Federal Protections You Cannot Be Forced to Waive
Providers sometimes ask you to sign a form consenting to out-of-network charges. These waivers are not valid for ancillary services—you cannot be asked to waive protections for anesthesia, radiology, pathology, lab work, or the other bundled support services, even if you sign a form saying you will. Those protections are mandatory, and no document or conversation changes that.
For non-ancillary out-of-network services at an in-network facility, a valid waiver must meet strict conditions: the provider must give you CMS's standard notice-and-consent form in writing, at least 72 hours before your scheduled procedure, and you must have genuine opportunity to refuse and still receive care. A signature obtained during emergency treatment, within 72 hours of scheduling, or on an informal document does not legally bind you. If you receive a balance bill after signing a waiver, the burden is on the provider to prove the consent was valid—and informal or rushed waivers rarely meet that standard.
The Ambulance Gap—Where Federal Law Leaves You Exposed
Ground ambulances are not covered by the No Surprises Act, even if they transport you to an in-network surgery center or hospital. An out-of-network ambulance company can send you a separate bill for the full amount they charge, and your insurance may pay far less—leaving you liable for the balance. This gap affects only ground ambulances (not air transport), but ground transport is the most common form and the source of many surprise bills.
As of 2026, 22 states have enacted their own protections for ambulance billing, though many of these laws apply only to state-regulated health plans and not to employer-sponsored insurance. New Hampshire prohibits balance billing for ground ambulances outright; North Dakota caps charges at 250 percent of Medicare rates; Utah requires insurers to pay the full state-set fee schedule. If you live outside these protected states, you have no federal or state bar against ambulance balance bills—a gap that can cost hundreds or thousands of dollars in a single call.
What to Do If You Receive a Balance Bill
If you receive a bill marked as your responsibility from an out-of-network provider at an in-network surgery center, do not pay it automatically. First, determine whether it is for an ancillary service (anesthesia, radiology, pathology, lab, neonatology) or another type of service. If it is ancillary, you are protected under federal law and the bill is likely illegal—contact your insurance company and ask them to reconsider under the No Surprises Act.
For non-ancillary services, ask the provider for a copy of the consent form they claim you signed. If no valid form exists, or if you signed it fewer than 72 hours before your procedure, or during emergency treatment, tell the provider and your insurance company the consent was not valid under federal law. Document everything: dates, procedure details, provider names, and copies of any forms. If your state has ground ambulance protections and you are being balance billed for transport, report the bill to your state's insurance commissioner or attorney general—these offices investigate violations and can compel refunds.
Understanding the "Non-Ancillary" Gap
Not all services at a surgery center fall into the eight protected ancillary categories, and the law allows providers to charge you for some non-ancillary out-of-network services if you receive valid advance notice and consent. The distinction matters: a consulting specialist brought in for your particular case may not be ancillary, meaning a proper waiver could be enforceable.
An emergency physician, facility medical director, or specialty surgeon may fall into this category depending on how the facility staffs the procedure. This is where the details matter and where many patients find themselves confused. When in doubt, ask your surgery center at scheduling whether any providers are out-of-network, which services they perform, and whether those services fall under the ancillary protections or require a waiver.
A reputable facility will answer this question directly and provide a standard CMS form if a waiver is needed. Evasion, delay, or an informal document is a red flag that the facility is not following the law.
Frequently Asked Questions
Can a surgery center ask me to waive my protections for anesthesia?
No. Anesthesia, radiology, pathology, lab work, and other ancillary services are protected by federal law, and you cannot legally waive those protections no matter what you sign. Any waiver for ancillary services is void.
What is the difference between a valid waiver and an invalid one?
A valid waiver uses the CMS standard notice-and-consent form, is provided in writing at least 72 hours before your scheduled procedure, and gives you genuine choice to refuse. Waivers signed during emergency treatment, within 72 hours of scheduling, or on an informal document do not meet the legal standard.
My state is not on the list of ambulance protection states—what can I do?
Federal law does not cover ground ambulances, so your protection depends on state law. If your state has no protections, contact your state insurance commissioner or attorney general's office to report balance bills—these offices track violations and may pursue enforcement.