Blog

How to Dispute a Surprise ER Bill

March 2026

You went to the emergency room at an in-network hospital. You didn't pick which doctor treated you. Weeks later, a $4,200 bill shows up from an out-of-network emergency physician. This happens to roughly 1 in 5 ER patients, according to a Kaiser Family Foundation study. The good news: federal law is on your side.

What the No Surprises Act actually does

Since January 2022, the No Surprises Act prohibits out-of-network providers from billing you more than in-network cost-sharing for emergency services. That means if your plan's ER copay is $250, that's your maximum obligation — not the $4,200 the provider billed. The provider and your insurer have to sort out the rest between themselves through an independent dispute resolution process.

EMTALA (the Emergency Medical Treatment and Labor Act) also matters here. It requires hospitals to stabilize emergency patients regardless of insurance. Providers who treat you under EMTALA can't turn around and balance bill you for choosing their facility — you didn't choose anything.

Steps before you send the letter

First, get an itemized bill. Many surprise bills arrive as a single line item with no detail. Call the billing department and ask for CPT codes and individual charges. Second, check your Explanation of Benefits from your insurer. If they already processed the claim at in-network rates, the provider shouldn't be billing you the difference. Third, document the date and time of your ER visit, the hospital name, and the treating provider's name.

Sample dispute letter

Below is the kind of letter Simpler Disputes generates, customized with your specific details. This example covers a $4,200 surprise ER bill from an out-of-network provider at an in-network hospital.

Re: Dispute of Balance Bill — Account #[Your Account Number] Dear Billing Department, I am writing to dispute a charge of $4,200 for emergency services provided on [date] at [Hospital Name]. The treating physician, Dr. [Name], was out-of-network, but I received care at an in-network facility during an emergency visit. Under the No Surprises Act (Public Law 117-169), providers are prohibited from balance billing patients for emergency services beyond applicable in-network cost-sharing amounts. My plan's ER cost-sharing is $250, which I have already paid. Additionally, EMTALA required this facility to provide emergency stabilization. I did not have the ability to select my treating physician, and I should not bear financial responsibility for the network status of providers assigned to my care. I am requesting that you: 1. Withdraw the $4,200 balance bill immediately 2. Adjust my account to reflect only the in-network cost-sharing amount 3. Pursue any remaining balance through the independent dispute resolution process with my insurer If this bill has been reported to any credit bureau, I request immediate correction. I expect written confirmation of the adjustment within 30 days. Sincerely, [Your Name] [Your Address] [Date]

What to do if they don't respond

File a complaint with the Centers for Medicare & Medicaid Services (CMS) at 1-800-985-3059. You can also file with your state's insurance commissioner. Most providers comply once they realize you know the law — the penalties for No Surprises Act violations are up to $10,000 per occurrence.

Keep copies of everything you send. Use certified mail or get delivery confirmation if sending physical letters. If you submit electronically through a patient portal, screenshot the submission.

Need a dispute letter customized to your situation?

Generate your letter

Simpler Disputes creates personalized dispute letters in under a minute. Each letter references the specific laws that apply to your case, names the provider and amounts involved, and tells you exactly what to ask for. One-time payment, no subscription.