Balance Billing: What It Is and How to Fight It

You went to the emergency room, confirmed your insurance covered the visit, and thought you were in the clear. Then weeks later, a bill arrived for $3,000 from a doctor you don't remember meeting. Welcome to balance billing—one of the most frustrating practices in American healthcare. Here's what it is, how to spot it, and most importantly, how to fight back.

What is Balance Billing?

Balance billing occurs when an out-of-network healthcare provider bills you for the difference between what they charge and what your insurance pays. If a doctor charges $5,000 for a procedure but your insurance only pays $2,000, you could be "balance billed" for the remaining $3,000.

According to the Consumer Financial Protection Bureau, this practice is particularly harmful because patients often have no idea the provider was out-of-network until the bill arrives.

How Balance Billing Happens

Balance bills don't happen randomly. They typically occur in predictable scenarios where patients have little or no control over which providers treat them:

1. Emergency Room Visits

During an emergency, you can't choose your hospital or doctors. Even if the ER is in-network, the emergency physician, radiologist, or other specialists may be out-of-network. Research from Yale found that 21.9% of patients saw out-of-network emergency physicians at in-network hospitals. See our ER billing errors guide for more on fighting these charges.

2. Surprise Providers at In-Network Facilities

You schedule surgery at an in-network hospital, but the anesthesiologist, assistant surgeon, or pathologist turns out to be out-of-network. You never chose these providers—they were assigned to your case—but you could still receive their bills.

3. Lab Work and Imaging

Your in-network doctor orders blood work or an MRI, but sends it to an out-of-network lab or imaging center. The bill goes to you.

4. Post-Stabilization Care

After emergency treatment, you might be transferred to or held at an out-of-network facility, or treated by out-of-network specialists for follow-up care.

The Numbers: How Common is Balance Billing?

According to Kaiser Family Foundation research:

• 1 in 6 emergency room visits and hospital stays involve at least one out-of-network charge
• 1 in 5 insured adults received an unexpected out-of-network bill in the past two years
• 18% of people received unexpected bills of $1,000 or more
• 2/3 of Americans worry about affording unexpected medical bills

Average Balance Bill Amounts

Federal Protection: The No Surprises Act

The good news: The No Surprises Act, effective January 1, 2022, provides significant federal protections against balance billing. If you have group or individual health insurance, you're protected from balance billing in most surprise billing scenarios.

What's Protected

• Emergency services at any facility (in- or out-of-network)
• Out-of-network providers at in-network facilities (anesthesiologists, radiologists, pathologists, etc.)
• Air ambulance services from out-of-network providers

What's NOT Protected

• Ground ambulance services — A major gap. Nearly 80% of ground ambulance rides result in out-of-network bills
• Care you knowingly choose from out-of-network providers
• Services where you signed a consent waiver
• Short-term insurance plans and health care sharing ministries

State Protections

Many states have their own balance billing laws that may offer additional protections. The federal law acts as a "floor"—if your state law is stronger, the state law applies.

States with Comprehensive Protections

According to the Commonwealth Fund, these states have comprehensive balance billing protections:

• California — Extensive protections since 2017; requires insurers to pay 125% of Medicare or average contracted rate
• New York — First state with comprehensive protections; reduced out-of-network ER billing by 88%
• Texas — Mediation system; covers emergency ground ambulance as of 2024
• Florida — Protections for emergency and non-emergency services
• Colorado, Connecticut, Illinois, Maryland, New Mexico — All have comprehensive laws

Ground Ambulance State Protections

Since federal law doesn't cover ground ambulances, 20 states have enacted their own protections. However, these state laws often cannot regulate self-funded employer plans, which cover about 65% of workers with employer insurance.

How to Fight a Balance Bill: Step-by-Step

If you receive a balance bill, don't pay it immediately. Follow these steps to dispute it:

Step 1: Request an Itemized Bill

Ask for a detailed statement showing each service, CPT codes, and charges. According to CMS guidance, you have the right to this information. Verify the codes reflect actual services you received.

Step 2: Determine if You're Protected

Ask yourself:

• Was this an emergency service?
• Was I treated at an in-network facility by an out-of-network provider I didn't choose?
• Was this air ambulance transport?
• Did I sign any consent waivers?

If you answered yes to the first three and no to the last, you're likely protected by the No Surprises Act.

Step 3: Contact Your Insurance Company

Call customer service and explain you believe this is a balance bill that violates the No Surprises Act. Ask them to reprocess the claim and confirm your cost-sharing should be calculated at in-network rates.

Step 4: Contact the Provider

Call the billing department and state that the bill violates the No Surprises Act. Request they:

• Adjust the bill to reflect your in-network cost-sharing only
• Work directly with your insurance for the remaining payment
• Provide documentation that you waived your protections (if they claim you did)

Step 5: File a Formal Dispute

If the provider won't correct the bill, you have formal options:

Step 6: Contact Your State Insurance Department

State agencies can investigate and intervene on your behalf. They have the authority to contact both the provider and insurer. Find your state insurance department at NAIC.org.

How to Write a Balance Bill Dispute Letter

A well-written dispute letter can be highly effective. Include these elements:

1. Your information: Name, address, phone, email, account number, date of service
2. Clear statement: "I am disputing this balance bill"
3. Legal basis: Reference the No Surprises Act (effective January 1, 2022)
4. Facts of your case: Describe the emergency or in-network facility situation
5. Your demand: Request the bill be adjusted to in-network cost-sharing only
6. Documentation: List any attachments (itemized bill, EOB, etc.)
7. Deadline: Request response within 30 days

Sample Opening Paragraph

Protections for Uninsured Patients

If you're uninsured or choose to self-pay, the No Surprises Act still helps you:

Good Faith Estimates

Healthcare providers must give you a written estimate of expected charges before scheduled services. If your final bill exceeds the estimate by $400 or more, you can dispute it through the Patient-Provider Dispute Resolution process.

How to Dispute (Uninsured)

1. File your dispute within 120 days of receiving the bill
2. Pay a $25 administrative fee (refunded if you win)
3. The provider cannot pursue collections during the dispute
4. A third-party reviewer determines a fair payment amount

Your Success Rate

Disputing bills works more often than you might think:

• 75% of people who disputed billing errors had mistakes corrected
• 62% who reached out about unaffordable bills got a payment plan or price reduction

The key is to dispute promptly and document everything.

Red Flags: When to Suspect Balance Billing

Watch for these warning signs:

• A separate bill arrives from a provider you don't recognize
• The bill shows "out-of-network" charges for emergency care
• You're billed more than your normal in-network cost-sharing
• The bill is for anesthesia, radiology, pathology, or similar services at an in-network facility
• The amount seems much higher than your Explanation of Benefits (EOB) indicated

How to Prevent Balance Bills

While you can't always prevent balance bills, these steps reduce your risk:

Before Scheduled Care

• Ask if ALL providers involved in your care are in-network (surgeon, anesthesiologist, etc.)
• Request a list of all providers who may treat you
• If uninsured, request a Good Faith Estimate in writing
• Don't sign consent waivers unless you fully understand the costs

After Receiving Care

• Review your Explanation of Benefits (EOB) carefully
• Compare all bills against your EOB
• Question any charges that seem inconsistent
• Act quickly—don't wait to dispute

Frequently Asked Questions

Can I be balance billed for emergency care?

No. Under the No Surprises Act, emergency services are protected regardless of network status. You can only be charged your in-network cost-sharing amount.

What if the provider says I signed a waiver?

Request a copy of the signed waiver. Waivers are only valid if: (1) you received written notice at least 72 hours before service, (2) the notice included a cost estimate, (3) you signed voluntarily, and (4) an in-network alternative was available. Waivers can never be used for emergency services.

Are ground ambulances covered?

Unfortunately, no. Ground ambulance services are the biggest gap in the No Surprises Act. Check if your state has ground ambulance balance billing protections.

How long do I have to dispute a balance bill?

There's no specific federal deadline, but act quickly. For uninsured patients disputing bills that exceed Good Faith Estimates, you have 120 days from receiving the bill.

Will disputing affect my credit?

Medical debt reporting rules changed significantly in 2023. Paid medical debt and unpaid medical debt under $500 can no longer appear on credit reports. Additionally, new medical debt has a 365-day waiting period before it can be reported, and 15 states now ban medical debt on credit reports entirely. However, it's still best to resolve disputes before accounts go to collections.

How Health Bill Central Helps

Health Bill Central can help you identify and fight balance bills by:

• Analyzing your bills to flag potential balance billing violations
• Comparing charges against what you should owe under the No Surprises Act
• Generating dispute letters that cite your legal protections
• Helping you understand your Explanation of Benefits
• Identifying whether your situation qualifies for federal or state protection

For a comprehensive overview of the law that protects you, see our No Surprises Act guide. If you need to dispute a bill, our step-by-step appeal guide walks you through the process.

The Bottom Line

Balance billing was once one of the most predatory practices in healthcare—patients trapped between providers and insurers, often owing thousands for care they couldn't avoid and didn't choose. The No Surprises Act has fundamentally changed this, but only if you know your rights and are willing to assert them.

Remember:

1. Emergency care and out-of-network providers at in-network facilities are protected by federal law
2. You can only be charged your in-network cost-sharing amount for protected services
3. Never pay a surprise bill without questioning it first
4. Disputing works—75% of errors get corrected when patients speak up
5. Ground ambulances are the exception—check your state's laws
6. You don't have to sign consent waivers, especially for emergency care

Don't let providers or insurers intimidate you. The law is on your side.

Resources

• CMS No Surprises Act Information
• CMS - Ending Surprise Medical Bills
• CFPB - Surprise Medical Bills and the No Surprises Act
• Kaiser Family Foundation - Surprise Medical Bills
• Commonwealth Fund - State Balance-Billing Protections Map
• Find Your State Insurance Department