Balance Billing in Health Insurance

Balance billing happens after you’ve paid your deductible, coinsurance or copayment and your insurance company has also paid everything it’s obligated to pay toward your medical bill. If there is still a balance owed on that bill and the healthcare provider or hospital expects you to pay that balance, you’re being balance billed.

Close-Up Of Cropped Hand Filling Insurance Claim Form On Desk
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Is Balance Billing Legal or Not?

Sometimes it’s legal, and sometimes it isn’t; it depends on the circumstances and your state’s insurance laws.


Balance billing is generally illegal:

  • When you have Medicare and you’re using a healthcare provider that accepts Medicare assignment
  • When you have Medicaid and your healthcare provider has an agreement with Medicaid
  • When your healthcare provider or hospital has a contract with your health plan and is billing you more than that contract allows

In each of these cases, the agreement between the healthcare provider and Medicare, Medicaid, or your insurance company includes a clause that prohibits balance billing.

For example, when a hospital signs up with Medicare to see Medicare patients, it must agree to accept the Medicare negotiated rate, including your deductible and/or coinsurance payment, as payment in full. This is called accepting Medicare assignment.


Balance billing is usually legal:

  • When you’re using a healthcare provider that doesn’t have a relationship or contract with your insurer (including Medicare or Medicaid)
  • When you’re getting services that aren’t covered by your health insurance policy, even if you’re getting those services from a provider that has a contract with your health plan

The first case (a provider not having an insurer relationship) is common if you seek care outside of your health insurance plan's network. Depending on how your plan is structured, it may cover some out-of-network costs on your behalf. But the out-of-network provider is not obligated to accept your insurer's payment as payment in full. They can send you a bill for the remainder of the charges, even if it's more than your plan's out-of-network copay or deductible. (Some health plans, particularly HMOs and EPOs, simply don't cover non-emergency out-of-network services at all, which means they would not cover even a portion of the bill if you choose to go outside the plan's network.)

Getting services that are not covered is a situation may arise, for example, if you obtain cosmetic procedures that aren’t considered medically necessary. In this case, you’ll be responsible for the entire bill, and your insurer will not require the medical provider to write off any portion of the bill—the claim would simply be rejected.

Since health insurance is regulated by each state, a state’s laws can impact whether and when balance billing is legal. Some states have specific laws about balance billing—generally in cases where the patient had no reasonable alternative that wouldn't have resulted in a balance bill.

The Commonwealth Fund has an extensive resource with details about state laws regarding "surprise" balance billing, which happens in emergency situations or when a patient inadvertently sees an out-of-network provider at an in-network facility.

And as described below, a new federal law will ban "surprise" balance billing as of 2022, protecting people from balance bills in emergency situations and when an out-of-network provider performs services at an in-network facility.

How Balance Billing Works

When you get care from a doctor, hospital, or other healthcare provider that isn’t part of your insurer’s provider network (or, if you have Medicare, from a provider that has opted out of Medicare altogether, which is rare but does apply in some cases), that healthcare provider can charge you whatever he or she wants to charge you.

Since your insurance company hasn’t negotiated any rates with that provider, he or she isn't bound by a contract with your health plan.

Medicare Limiting Charge

If you have Medicare and your healthcare provider is a nonparticipating provider but hasn't entirely opted out of Medicare, you can be charged up to 15% more than the allowable Medicare amount for the service you receive (some states impose a lower limit).

This 15% cap is known as the limiting charge, and it serves as a restriction on balance billing in some cases. If your healthcare provider has opted out of Medicare entirely, they cannot bill Medicare at all and you'll be responsible for the full cost of your visit.

If your health insurance company agrees to pay a percentage of your out-of-network care, the health plan doesn’t pay a percentage of what’s actually billed. Instead, it pays a percentage of what it says should have been billed, otherwise known as a reasonable and customary amount.

As you might guess, the reasonable and customary amount is usually lower than the amount you’re actually billed. The balance bill comes from the gap between what your insurer says is reasonable and customary, and what the healthcare provider or hospital actually charges.


Let's take a look at an example of a hospitalization with 20% coinsurance for in-network hospitalization and 40% coinsurance for out-of-network hospitalization.

In this scenario, we'll assume that the person already met their $1,000 in-network deductible and $2,000 out-of-network deductible earlier in the year (so the example is only looking at coinsurance).

And we'll also assume that the health plan has a $6,000 maximum out-of-pocket for in-network care, but no cap on out-of-pocket costs for out-of-network care:

  In-network hospital Out-of-network hospital
Coverage 20% coinsurance with a $6,000 maximum out-of-pocket, including $1,000 deductible that has already been met earlier in the year 40% coinsurance with no maximum out-of-pocket, but a deductible that has already been met) with balance bill
Hospital charges $60,000 $60,000
Insurer negotiates a discounted rate of $40,000 There is no discount because this hospital is out-of-network
Insurer's reasonable and customary rate   $45,000
Insurer pays $35,000 (80% of the negotiated rate until the patient hits their maximum out-of-pocket, then the insurer pays 100%) $27,000 (60% of the $45,000 reasonable and customary rate)
You pay coinsurance of $5,000 (20% of the negotiated rate, until you hit the maximum out-of-pocket of $6,000. This is based on the $1,000 deductible paid earlier in the year, plus the $5,000 from this hospitalization) $18,000 (40% of $45,000)
Balance billed amount $0 (the hospital is required to write-off the other $40,000 as part of their contract with your insurer) $15,000 (The hospital's original bill minus insurance and coinsurance payments)
When paid in full, you’ve paid $5,000 (Your maximum out-of-pocket has been met. Keep in mind that you already paid $1,000 earlier in the year for your deductible) $33,000 (Your coinsurance plus the remaining balance.)

When Does Balance Billing Happen?

In the United States, balance billing usually happens when you get care from a healthcare provider or hospital that isn’t part of your health insurance company’s provider network or doesn’t accept Medicare or Medicaid rates as payment in full.

If you have Medicare and your healthcare provider has opted out of Medicare entirely, you're responsible for paying the entire bill yourself. But if your healthcare provider hasn't opted out but just doesn't accept assignment with Medicare (ie, doesn't accept the amount Medicare pays as payment in full), you could be balance billed up to 15% more than Medicare's allowable charge, in addition to your regular deductible and/or coinsurance payment.

Surprise Balance Billing

Receiving care from an out-of-network provider can happen unexpectedly, even when you try to stay in-network. This can happen in emergency situations—when you may simply have no say in where you're treated or no time to get to an in-network facility—or when you're treated by out-of-network providers who work at in-network facilities.

For example, you go to an in-network hospital, but the radiologist who reads your X-rays isn’t in-network. The bill from the hospital reflects the in-network rate and isn't subject to balance billing, but the radiologist doesn’t have a contract with your insurer, so he can charge you whatever he wants and is free to balance bill (subject to various state and federal rules, described below).

Similar situations arise with:

  • Anesthesiologists
  • Pathologists (laboratory doctors)
  • Neonatologists (doctors for newborns)
  • Intensivists (doctors who specialize in ICU patients)
  • Hospitalists (doctors who specialize in hospitalized patients)
  • Radiologists (doctors who interpret X-rays and scans)
  • ER doctors
  • Ambulance services to get you to the hospital, especially air ambulance services, where balance billing is frighteningly common
  • Durable medical equipment suppliers (companies that provide the crutches, braces, wheelchairs, etc. that people need after a medical procedure)

It can also happen for services received from a provider chosen by someone else, such as when you have a pap smear or a biopsy done in your healthcare provider’s office, or blood drawn by your home health nurse. If your healthcare provider or nurse sends the specimen to an out-of-network lab, that lab can balance bill you.

These "surprise" balance billing situations are particularly infuriating for patients, who often believe that as long as they've selected an in-network medical facility, all of their care will be covered under the in-network terms of their health plan.

To address this situation, several states have enacted consumer protection rules that limit surprise balance billing. It's important to note that state rules generally only apply to state-regulated health plans. Self-insured plans, which are what most large employers use, are regulated by federal law, under ERISA, and are not subject to state laws. (Federal rules, described below, take effect in 2022 to address surprise balance billing nationwide, on both state-regulated and federally-regulated health plans.)

For example:

  • Arizona enacted Senate Bill 1441 in 2017. It took in 2019, and allows patients who receive a surprise balance bill (from an out-of-network provider who performed services at an in-network facility) of $1,000 or more to seek arbitration. The arbitration process resolves the issue between the medical provider and the insurance company, thus absolving the patient of responsibility for the balance bill. 
  • New York has protected patients from surprise balance billing since 2015.
  • California enacted AB72 in 2016; it applies to plans issued or renewed on or after July 1, 2017, and prevents patients from having to pay out-of-network charges for care received at in-network facilities.
  • Florida enacted HB221 in 2016. The legislation protects patients from surprise balance billing in emergency situations and in situations where the patient seeks care at an in-network facility and is then treated—without another option—by an out-of-network provider within the facility.
  • Montana has enacted a series of bills to protect patients from balance billing from air ambulance providers.
  • Tennessee enacted SB1869 in 2018. The legislation requires medical facilities to disclose to patients, in writing and prior to treatment, if any of the medical providers at the facility are out-of-network with the patient's insurance. And out-of-network insurers working at a facility that's in-network with the patient's insurance cannot balance bill the patient unless they have also provided written disclosure to the patient about the lack of in-network insurance coverage for their services.
  • Colorado, Texas, Nevada, and Washington passed laws in 2019 to protect patients from surprise balance bills (in some cases, they were enhancements of existing laws).

For several years, states have been working to protect consumers from surprise balance billing, but as noted above, these state rules don't protect people with self-insured employer-sponsored health plans, which cover the majority of people who have employer-sponsored coverage.

There has long been broad bipartisan support for the idea that patients shouldn't have to pay additional, unexpected charges just because they needed emergency care or inadvertently received care from a provider outside their network, despite the fact that they had purposely chosen an in-network medical facility. There was disagreement, however, in terms of how these situations should be handled—should the insurer have to pay more, or should the out-of-network provider have to accept lower payments? This disagreement derailed numerous attempts at federal legislation to address surprise balance billing.

But the Consolidated Appropriations Act, 2021, which was enacted in December 2020, includes broad provisions to protect consumers from surprise balance billing as of 2022. The law applies to both self-insured and fully-insured plans, including grandfathered plans, employer-sponsored plans, and individual market plans.

It protects consumers from surprise balance billing charges in nearly all emergency situations and situations when out-of-network providers offer services at in-network facilities, but there's a notable exception for ground ambulance charges. This is still a concern, as ground ambulances are among the medical providers most likely to balance bill patients and least likely to be in-network, and patients typically have no say in what ambulance provider comes to their rescue in an emergency situation. But other than ground ambulances, patients will no longer be subject to surprise balance bills as of 2022.

Balance billing in other situations (eg, the patient simply chooses to use an out-of-network provider) will continue to be allowed.

Balance billing doesn’t usually happen with in-network providers or providers that accept Medicare assignment. That's because if they balance bill you, they’re violating the terms of their contract with your insurer or Medicare. They could lose the contract, face fines, suffer severe penalties, and even face criminal charges in some cases.

An exception to this occurs when you’re using an in-network provider, but you’re getting a service that isn’t covered by your health insurance. Since an insurer doesn’t negotiate rates for services it doesn’t cover, you’re not protected by that insurer-negotiated discount. The provider can charge whatever he or she wishes, and you’re responsible for the entire bill.

If You Get an Unexpected Balance Bill

Receiving a balance bill is a stressful experience, especially if you weren't expecting it. You've already paid your deductible and coinsurance and then you receive a substantial additional bill—what do you do next?

First, you'll want to try to figure out whether the balance bill is legal or not. If the medical provider is in-network with your insurance company, or you have Medicare or Medicaid and your provider accepts that coverage, it's possible that the balance bill was a mistake (or, in rare cases, outright fraud).

If you think that the balance bill was an error, contact the medical provider's billing office and ask questions. Keep a record of what they tell you so that you can appeal to your state's insurance department if necessary.

If the medical provider's office clarifies that the balance bill was not an error and that you do indeed owe the money, consider the situation—did you make a mistake and select an out-of-network healthcare provider? Or did you go to an in-network facility and then end unexpectedly up receiving care from a provider who isn't in your insurer's network?

If you went to an in-network facility but ended up inadvertently receiving care from an out-of-network provider who works there, contact your state's insurance department to see if there are any consumer protections in place in your state for situations like that (as noted above, federal protections will exist as of 2022).

Your state may have rules that require the facility and/or the provider to have notified you of the potential out-of-network charges before you received treatment.

If not, you may not be able to avoid the balance bill, but you may still be able to reduce it. Similarly, if you opted to go to an out-of-network provider, there's not really any way around the fact that you're going to have to pay the balance bill—but you might be able to pay less than you're being billed.

Negotiate With the Medical Office

If you've received a legitimate balance bill, you can ask the medical office to cut you some slack. They may be willing to agree to a payment plan and not send your bill to collections as long as you continue to make payments.

Or they may be willing to reduce your total bill if you agree to pay a certain amount upfront. Be respectful and polite, but explain that the bill caught you off guard, and if it's causing you significant financial hardship, explain that too.

The healthcare provider's office would rather receive at least a portion of the billed amount rather than having to wait while the bill is sent to collections, so the sooner you reach out to them, the better.

Negotiate With Your Insurance Company

You can also negotiate with your insurer. If your insurer has already paid the out-of-network rate on the reasonable and customary charge, you’ll have difficulty filing a formal appeal since the insurer didn’t actually deny your claim. It paid your claim, but at the out-of-network rate.

Instead, request a reconsideration. You want your insurance company to reconsider the decision to cover this as out-of-network care, and instead cover it as in-network care. You’ll have more luck with this approach if you had a compelling medical or logistical reason for choosing an out-of-network provider.

If you feel like you’ve been treated unfairly by your insurance company, follow your health plan’s internal complaint resolution process.

You can get information about your insurer’s complaint resolution process in your benefits handbook or from your human resources department. If this doesn’t resolve the problem, you can complain to your state’s insurance department. Find contact information for your Department of Insurance by clicking your state on this map.

If your health plan is self-funded, meaning your employer is the entity actually paying the medical bills even though an insurance company may administer the plan, then your health plan won't fall under the jurisdiction of your state’s department of insurance.

Self-funded plans are instead regulated by the Department of Labor’s Employee Benefit Services Administration. Get more information from the EBSA’s consumer assistance web page or by calling an EBSA benefits advisor at 1-866-444-3272.

If You Know You’ll Be Legally Balance Billed

If you know in advance that you’ll be using an out-of-network provider or a provider that doesn’t accept Medicare assignment, you have some options. However, none of them are easy and all require some negotiating.

Ask for an estimate of the provider’s charges. Next, ask your insurer what they consider the reasonable and customary charge for this service to be. Getting an answer to this might be tough, but be persistent.

Once you have estimates of what your provider will charge and what your insurance company will pay, you’ll know how far apart the numbers are and what your financial risk is. With this information, you can narrow the gap. There are only two ways to do this: Get your provider to charge less or get your insurer to pay more.

Ask the provider if he or she will accept your insurance company’s reasonable and customary rate as payment in full. If so, get the agreement in writing, including a no-balance-billing clause.

If your provider won’t accept the reasonable and customary rate as payment in full, start working on your insurer. Ask your insurer to increase the amount they’re calling reasonable and customary for this particular case.

Present a convincing argument by pointing out why your case is more complicated, difficult, or time-consuming to treat than the average case the insurer bases its reasonable and customary charge on.

Single-Case Contract

Another option is to ask your insurer to negotiate a single-case contract with your out-of-network provider for this specific service.

A single-case contract is more likely to be approved if the provider is offering specialized services that aren't available from locally-available in-network providers, or if the provider can make a case to the insurer that the services they're providing will end up being less expensive in the long-run for the insurance company.

Sometimes they can agree upon a single-case contract for the amount your insurer usually pays its in-network providers. Sometimes they’ll agree on a single-case contract at the discount rate your healthcare provider accepts from the insurance companies she’s already in-network with.

Or, sometimes they can agree on a single-case contract for a percentage of the provider’s billed charges. Whatever the agreement, make sure it includes a no-balance-billing clause.

Ask for the In-Network Coinsurance Rate

If all of these options fail, you can ask your insurer to cover this out-of-network care using your in-network coinsurance rate. While this won’t prevent balance billing, at least your insurer will be paying a higher percentage of the bill since your coinsurance for in-network care is lower than for out-of-network care.

If you pursue this option, have a convincing argument as to why the insurer should treat this as in-network. For example, there are no local in-network surgeons experienced in your particular surgical procedure, or the complication rates of the in-network surgeons are significantly higher than those of your out-of-network surgeon.


Try to prevent balance billing by staying in-network and making sure your insurance company covers the services you’re getting, and that you comply with any pre-authorization requirements. If you’re having X-rays, MRIs, CT scans, or PET scans, make sure both the imaging facility and the radiologist who will read your scan are in-network.

If you’re planning to have surgery, ask whether the anesthesiologists are in-network. If you're going to have knee surgery, ask whether the supplier that provides the crutches and knee brace is in your insurance network. The more questions you ask, the less likely you are to be surprised by unexpected bills after your medical care is complete.

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8 Sources
Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. Kona M. The Commonwealth Fund. State balance billing protections. April 20, 2020.

  2. H.R.133—Consolidated Appropriations Act, 2021. Enacted December 27, 2021.

  3. Opt Out Affidavits.

  4. Chhabra, Karan; Schulman, Kevin A.; Richman, Barak D. Health Affairs. Are Air Ambulances Truly Flying Out Of Reach? Surprise-Billing Policy And The Airline Deregulation Act. October 17, 2019.

  5. United States Department of Labor. Employee Retirement Income Security Act.

  6. Beckman, Kristen. Business Insider. Montana tackles air ambulance expenses. July 3, 2017.

  7. Sutton, Jon H. Bulletin of the American College of Surgeons. State legislatures consider surprise billing legislation in 2019. November 1, 2019.

  8. Kaiser Family Foundation. 2020 Employer Health Benefits Survey. October 8, 2020.

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