Balance Billing

Balance billing is the practice of a health care provider billing a patient for the difference between the provider's charge and the amount the patient's plan treats as the price of the service. If a clinic charges $2,400 and the plan recognizes $900, the $1,500 gap is the balance, and billing the patient for it is balance billing.

The phrase is not formally defined in federal regulation, but it is the regulator's own word rather than an industry coinage. 42 U.S.C. 300gg-131 is headed "Balance billing in cases of emergency services", and subpart E of 45 C.F.R. part 149 runs three sections headed "Balance billing in cases of …" plus one on "patient protections against balance billing". The definitional weight sits in a different place, and it is the sentence to remember: 45 C.F.R. 149.30 defines cost sharing as the amount an enrollee is responsible for paying for a covered service, and provides that it "generally includes copayments, coinsurance, and amounts paid towards deductibles, but does not include amounts paid towards premiums, balance billing by out-of-network providers, or the cost of items or services that are not covered". A balance bill is therefore, as a matter of federal definition, not part of what you owe as a member of the plan. It is a separate claim by the provider against you.

Where the practice comes from is a contract that does not exist. A provider inside a plan's network has agreed to two things: a schedule of rates, and to accept the plan's payment plus the member's cost share as payment in full. The second promise is what makes balance billing impossible in network. It is not that in-network providers choose not to; it is that they have contracted away the right. A provider with no contract has given no such undertaking, and the amount it charged remains, as between it and the patient, the amount it charged. Nothing in the plan's determination of an allowed amount binds a stranger to that contract.

The consequence that catches people is the accumulator, not the arithmetic. Because a balance bill is not cost sharing, it does not reduce a deductible and it does not count toward the annual limitation on cost sharing. The out-of-pocket maximum page sets out the precise position, which is worth stating precisely rather than absolutely: out-of-network cost sharing itself is not required to count, and some plans count it anyway, while the balance above the allowed amount is excluded from the definition of cost sharing outright. So the annual ceiling a member relies on to bound a catastrophic year is measured against a number that the balance bill sits entirely outside of.

Federal law now prohibits the practice in three defined situations, and knowing which three is more useful than knowing that a law exists. Since plan years beginning on or after January 1, 2022, a nonparticipating provider or facility may not bill you more than in-network cost sharing for emergency services at a hospital emergency department or an independent freestanding emergency department; for non-emergency services delivered by an out-of-network provider at an in-network hospital, hospital outpatient department, critical access hospital or ambulatory surgical center, unless strict notice and consent requirements were met; or for air ambulance transport. In those situations the cost sharing is calculated as though the recognized amount were the in-network charge, and it must count toward the in-network deductible and in-network out-of-pocket maximum. The statute behind those rules, and the notice and consent exception with the list of services for which consent is never available, are the subject of the No Surprises Act page.

Where balance billing remains lawful is the part general coverage skips. Five categories are worth naming.

Ground ambulance. Congress covered air ambulance and did not cover ground transport, giving it an advisory committee on disclosure and consumer protection instead of a prohibition. Some states have legislated; many have not, and a state law generally cannot reach a self-funded employer plan. Congress itself described the size of the gap when it directed that committee to review options for improving the disclosure of ground ambulance charges and protecting consumers from balance billing, which is a description of the problem rather than a solution to it.

Non-emergency care where valid notice and consent was obtained. The exception is narrow and heavily conditioned, and it is unavailable altogether for a listed set of services, but where it is properly used the bill is lawful.

Services the plan does not cover at all. Here there is no allowed amount and therefore no "balance": the whole charge is the patient's, and the question is one of coverage rather than of billing practice.

Care paid for without insurance. A cash-pay or uninsured patient has no plan determining a price, so the concept does not apply; what applies instead is the good faith estimate regime, which the No Surprises Act page covers.

Medicare, on its own terms. A provider who has not agreed to accept assignment may charge above Medicare's approved amount up to a statutory limiting charge, and a provider who has opted out of Medicare entirely bills under a private contract. The Medicare Part B page owns that structure in full.

What to do with one. Three questions, in order. Was the care in one of the protected situations, in which case the bill may simply be prohibited. Did the plan's own directory list the provider as participating, which brings a separate federal protection into play on cost sharing. And is the balance an error rather than a policy, which is common enough that comparing the itemized bill against the explanation of benefits is the standard first move, and is covered on the medical debt page and in our guide to credit and debt.

1. The provider sets a charge. It is the provider's own number and is not negotiated with anyone.

2. The plan determines what it recognizes, either the contracted rate where there is a contract, or an amount it calculates where there is not.

3. The plan pays its share of that amount and leaves you the cost sharing.

4. In network, the gap disappears because the provider contracted to write it off.

5. Out of network, the gap is billed to you, unless a federal or state prohibition applies to the situation.

6. The gap does not count as cost sharing, so it does not advance your deductible or your annual ceiling.

A hypothetical, showing the two numbers separately. An out-of-network clinic bills $2,400. The plan determines an allowed amount of $900 and pays 80% of it, or $720, leaving $180 of coinsurance.

Cost sharing: $180. Balance bill: $2,400 − $900 = $1,500. Total out of pocket: $1,680.

Of that $1,680, only the $180 is cost sharing at all, and even that is not required to count toward the annual limitation because it was incurred out of network. The $1,500 is excluded from the definition of cost sharing outright, so it will never move an accumulator however large it becomes.

Had the clinic been in network at the same $900 allowed amount, the arithmetic above the line would be identical and the $1,500 would be written off by the provider. The patient's bill would be $180. The entire difference between $180 and $1,680 is the contract.

Balance billing is a practice rather than a product, so the honest framing is who it works for and where it stops.

What it is defensible for

• A provider outside a network has never agreed to a price with the plan, and the plan's unilateral determination of an allowed amount is not a negotiation.
• It is how care remains available from providers who decline network contracts, including in specialties where local networks are thin.
• For genuinely uncovered services there is no gap to speak of, because the patient was always paying the whole charge.

What is wrong with it in practice

• The patient frequently has no opportunity to choose, which is the entire premise of the federal prohibitions.
• The amount is unknowable in advance, since the charge and the plan's determination are both invisible until after the care.
• It is excluded from cost sharing, so it sits outside the deductible and the annual ceiling that a member reasonably believes bound their exposure.
• The largest category left outside the federal prohibitions, ground ambulance, involves a service nobody selects and often nobody is conscious for.
• Unpaid balances go to collections like any other bill, with the credit consequences that follow.