When Marcus, a father of two in Texas, drove his daughter to an in-network emergency room after she fell from a trampoline and broke her arm in March 2026, he expected his insurance to cover most of the cost. Weeks later, a bill for more than $8,400 arrived. The orthopedic specialist who set the fracture was out of network. His insurer applied only a fraction of the charge toward his deductible.

“I did everything right,” he wrote in a Reddit post that drew hundreds of replies from people with similar experiences. “I checked that the hospital was in-network. Nobody told me the doctor wasn’t.” (Marcus’s name has been changed to protect his privacy; his account is drawn from a public forum post.)

His story is not unusual. Across social media, patient advocacy forums, and state complaint databases, Americans continue to share ER bills running into the thousands, sometimes tens of thousands, of dollars, despite a federal law designed to make those charges disappear. The No Surprises Act, which took effect in January 2022, banned balance billing for emergency services and capped what patients owe at in-network rates. More than four years later, the gap between that promise and what families actually experience remains stubbornly wide.

The law on paper vs. the bill in your mailbox

The statute’s core protections are clear. Under CMS rules, an out-of-network emergency physician cannot send a patient a balance bill, the charge representing the gap between what an insurer pays and what a provider demands. Patients treated in an ER can be charged only what they would owe under their plan’s in-network cost-sharing terms. The same rule covers ancillary providers like anesthesiologists and radiologists who treat patients at in-network hospitals without the patient ever choosing them.

But eliminating balance billing did not eliminate high costs. A 2025 study published in The BMJ analyzed commercial insurance claims for privately insured adults using a difference-in-differences design, comparing out-of-pocket emergency spending before and after the law took effect. The researchers found that while the most extreme surprise bills declined, the median reduction in patient out-of-pocket costs for out-of-network emergency claims was modest, falling short of the near-complete relief policymakers had anticipated. The reason is structural: standard cost-sharing, including deductibles, copayments, and coinsurance, still applies even when the surprise-billing ban works exactly as intended. A family with a $5,000 deductible who visits the ER in January, before any other medical spending that year, can still face a bill covering every dollar up to that threshold.

Then there are the charges that fall into gray areas. Post-stabilization services, the care delivered after a patient is no longer in immediate danger, can generate separate bills if the patient is not transferred to an in-network facility. Consider a scenario that patient advocates describe as common: a person arrives at an in-network ER with chest pain, is stabilized, and then undergoes follow-up imaging or a specialist consultation while still in the hospital. Because those later services may be classified as post-stabilization rather than emergency care, the No Surprises Act’s balance-billing ban may not apply, and the patient can be left responsible for out-of-network charges they never agreed to. Facility fees, observation charges, and certain diagnostic tests may also land outside the narrow window the law covers. As federal guidance notes, the statute targets specific categories of unexpected charges, not every form of medical cost-sharing that can drain a household budget.

A dispute system buried under its own caseload

When insurers and providers cannot agree on payment for a covered service, the No Surprises Act routes the disagreement to an Independent Dispute Resolution process overseen by CMS. The system was designed as a backstop. It has become a bottleneck.

A Government Accountability Office report published in 2024 found that the volume of IDR disputes far exceeded the government’s original projections. Hundreds of thousands of cases flooded the system, and a significant share remained unresolved at the time of the audit. The GAO described the rollout as hampered by delays, process complexity, and staffing shortfalls that prevented timely resolution. CMS has since published quarterly dispute data through its Public Use Files. According to the GAO’s findings, the backlog has been shrinking as CMS has added certified IDR entities and streamlined intake, but a substantial number of cases remained pending at the time of the report.

For patients, the IDR logjam is mostly invisible. They are shielded from balance bills while disputes play out, at least on paper. In practice, billing errors, miscoded claims, and providers slow to update their systems can still result in collection notices landing in a patient’s mailbox. The Patient Advocate Foundation reports that consumers frequently need help navigating the complaint process even when the law is clearly on their side.

Why bills still shock patients who followed the rules

Several forces keep surprise charges alive despite the legal framework meant to stop them.

Network gaps remain common. Emergency departments often rely on staffing companies that contract physicians independently of the hospital’s insurance agreements. Marcus’s experience is a textbook example: he confirmed the hospital was in his plan’s network, but the orthopedic specialist who treated his daughter was employed by a separate staffing firm with no contract with his insurer. The No Surprises Act is supposed to hold the patient harmless in that scenario, but the BMJ study suggests the financial cushion has been thinner than expected, particularly for patients with high-deductible plans who still owe substantial cost-sharing even at in-network rates.

Many patients do not know their rights. The Kaiser Family Foundation’s 2024 health tracking poll found that roughly half of insured adults were either unaware of the No Surprises Act or unsure how its protections apply to them. Without clear information at the point of care, patients may pay bills they could legally challenge or fail to request a corrected claim when a charge violates the law.

The market is still adjusting. A separate GAO evaluation examined how in-network and out-of-network claims have shifted across specialties most tied to surprise billing, including emergency medicine, anesthesiology, and radiology. The report found movement, but the direction and size of those shifts vary by specialty and region. Some providers have joined networks to avoid the IDR process entirely. Others appear to be holding out for higher arbitration awards. Whether these shifts ultimately lower costs for patients or simply redistribute them between insurers and providers is not yet settled.

Ground ambulances are not covered. One of the most significant gaps in the No Surprises Act is that it does not apply to ground ambulance services. A patient transported by an out-of-network ambulance to an in-network ER can still receive a separate, unprotected balance bill for the ride. Congress directed the creation of an advisory committee to study the issue, but as of spring 2026, no federal legislation has closed this loophole.

What to do if you get a bill that looks wrong

Patients who receive an unexpected ER charge have more leverage than most realize, but they need to act quickly.

1. Check the explanation of benefits. Before paying anything, compare the bill to the EOB your insurer sends. If the provider is listed as out-of-network for an emergency service, the No Surprises Act likely applies, and you should not owe more than your in-network cost-sharing amount.

2. Contact your insurer. Ask whether the claim was processed under No Surprises Act protections. If it was not, request reprocessing. Insurers are required to apply in-network rates for covered emergency services regardless of the provider’s network status.

3. File a complaint. The federal No Surprises Help Desk (1-800-985-3059) accepts complaints from patients who believe they have been billed in violation of the law. Many states also operate their own surprise-billing complaint lines, and some state laws offer protections that go beyond the federal floor.

4. Do not ignore collection notices. If a disputed bill is sent to collections, document your dispute in writing and send it to both the collection agency and the provider. Under federal rules, a provider who violates the balance-billing ban can face penalties.

5. Ask about financial assistance. Nonprofit hospitals are required to maintain financial assistance policies under IRS rules. Even for-profit facilities sometimes offer payment plans or hardship discounts. If your bill is high but technically legal (because it reflects your deductible or coinsurance), these programs may still reduce what you owe.

ER billing protections have narrowed the worst abuses but left everyday costs untouched

The No Surprises Act has reduced certain extreme forms of balance billing, particularly when patients are treated by out-of-network clinicians inside in-network facilities. On that narrow front, the law is working. But persistent high out-of-pocket spending, a backlogged dispute resolution system, ground ambulance gaps, and uneven market responses show that predictable ER costs remain out of reach for many families.

Whether the remaining problems reflect fixable implementation failures or deeper structural gaps in the statute itself is the question federal regulators, researchers, and lawmakers are still trying to answer. For families like Marcus’s, the distinction does not matter much. The bill arrived weeks ago. It is sitting on the kitchen counter, waiting.