How to Spot Balance Billing After Surgery (And Fight Back)

You just had surgery. You checked that your surgeon and hospital were in-network. You did everything right.

Then, four weeks later, a bill arrives for $11,000. The anesthesiologist—someone you never chose, never met, and had no control over—was out-of-network. Now you're on the hook for the difference.

This is called balance billing, and it's one of the most common (and infuriating) medical billing practices in America. The good news? As of January 2022, the No Surprises Act protects you from most surprise bills. Here's how to spot balance billing and what to do about it.

What Is Balance Billing?

Balance billing happens when an out-of-network provider bills you for the difference between what your insurance paid and what they charged.

Here's an example:

Even though you chose an in-network hospital and surgeon, you had no say in who administered your anesthesia. That's the trap.

The No Surprises Act: Your Protection

The No Surprises Act (effective January 1, 2022) protects you from surprise bills in these situations:

1. Emergency care at an out-of-network facility

2. Non-emergency care at an in-network facility where an out-of-network provider treats you (like an anesthesiologist, radiologist, or assistant surgeon)

3. Air ambulance services from out-of-network providers

What this means for you: In these situations, you should only be charged your in-network cost-sharing amount (copay, coinsurance, or deductible). The provider and your insurance company must work out the rest—without involving you.

How to Spot Balance Billing on Your Bill

Look for these red flags:

1. **Multiple Provider Bills After One Procedure**

If you had surgery at one hospital but received separate bills from:

This is a setup for balance billing.

2. **"Out-of-Network" Charges You Didn't Authorize**

Check your Explanation of Benefits (EOB) from your insurance. If it says a provider was "out-of-network" but you:

You're likely protected by the No Surprises Act.

3. **Bills That Exceed Your In-Network Cost-Sharing**

If your insurance says you owe $500 (your deductible), but the provider is billing you $3,500, that's balance billing.

4. **Vague Line Items Like "Professional Services" or "Facility Fees"**

These catch-all terms can hide out-of-network charges. Always ask for an itemized bill with CPT codes so you know exactly what you're being charged for.

What to Do If You're Balance Billed

Step 1: Don't Pay Immediately

Balance billing is often illegal under the No Surprises Act. Don't pay the bill until you've verified whether you're actually responsible.

Step 2: Check Your EOB

Your insurance company's Explanation of Benefits will show:

If the provider is billing you more than your EOB says you owe, that's balance billing.

Step 3: Contact Your Insurance Company

Call your insurance company and say:

"I received a bill from [provider name] for [amount]. According to my EOB, I only owe [amount]. This appears to be balance billing, which is prohibited under the No Surprises Act. Can you confirm my out-of-pocket responsibility and contact the provider?"

Step 4: Dispute the Bill with the Provider

Send a written dispute to the provider's billing department. Use this script:

"I am writing to dispute the bill dated [date] for [amount]. I received care at an in-network facility and did not consent to out-of-network care. Under the No Surprises Act, I should only be responsible for my in-network cost-sharing amount of [amount per my EOB]. Please adjust this bill accordingly."

Step 5: File a Complaint

If the provider refuses to adjust the bill, file a complaint with:

Real-World Example: Mike's Story

Mike had shoulder surgery at an in-network hospital. His surgeon was in-network. But the anesthesiologist wasn't.

Six weeks later, Mike received a bill for $11,000 from the anesthesiologist's practice. His insurance had paid $4,000 (the out-of-network rate), and the provider wanted Mike to pay the remaining $7,000.

Mike knew something was wrong. He:

1. Checked his EOB: It said he owed $500 (his deductible)

2. Called his insurance: They confirmed the anesthesiologist was out-of-network but that Mike was protected under the No Surprises Act

3. Disputed the bill in writing

4. Filed a complaint with his state insurance commissioner

Result: The bill was adjusted to $500. Mike saved $10,500.

Key Takeaways

What BillDecoder Does

We automatically:

That surgery bill isn't final. Fight back and pay what's fair.

Ready to review your bill? Upload it to BillDecoder and we'll show you exactly what you owe—and what you don't.