Guide

Balance billing: in-network never, out-of-network sometimes

Summary

In-network, balance billing is never legal: your payer contract sets the copay, coinsurance, or deductible as the patient's full obligation for a covered service. Out-of-network, it depends. The No Surprises Act bans it for emergency care and for ancillary providers working at an in-network facility, but a genuinely elective out-of-network visit can still be billed, subject to notice-and-consent rules and whatever your state layers on top.

By Gale Editorial · Updated 2026-07-26. Every figure cited to a dated source. How we write.

In-network: balance billing isn't a gray area

A contract you sign with a payer sets the patient's cost-sharing (copay, coinsurance, deductible) as the full patient obligation for a covered service, and billing beyond that amount breaches the contract regardless of what the payer actually paid you. This isn't a coding question or a documentation gap; it's a contract term, and violating it risks termination from the panel.

Writing off the gap between your charge and the payer's allowed amount is the ordinary cost of being in-network, not a special hardship for any one claim. A payer that underpays relative to what you think the service is worth is a fee-negotiation problem, not a balance-billing opportunity — the fix runs through your next contract cycle, not the current patient's statement.

The federal floor: what the No Surprises Act actually bans

The No Surprises Act bans balance billing nationally in two settings: emergency services regardless of where they're delivered, and non-emergency services furnished by an out-of-network clinician at an in-network facility — anesthesiologists, radiologists, pathologists, assistant surgeons, and similar ancillary roles 1Ref 1Centers for Medicare & Medicaid Services (2026).No Surprise Billing.That the No Surprises Act bans balance billing in the emergency and in-network-facility-ancillary settings and requires good-faith estimates for uninsured/self-pay patients, with CMS hosting the implementing guidance2Ref 2Office of the Federal Register (2026).45 CFR Part 149 — Surprise Billing and Transparency Requirements.The operative regulation text for the NSA's good-faith-estimate content/timing requirements and the patient-provider dispute resolution process. Outside those two settings, the federal ban does not apply, and out-of-network billing remains legal with the right notice.

CMS hosts the implementing guidance for both the ban itself and the good-faith-estimate obligation that runs alongside it for uninsured and self-pay patients 1Ref 1Centers for Medicare & Medicaid Services (2026).No Surprise Billing.That the No Surprises Act bans balance billing in the emergency and in-network-facility-ancillary settings and requires good-faith estimates for uninsured/self-pay patients, with CMS hosting the implementing guidance; the operative regulation text, including the content and timing requirements for that estimate and the patient-provider dispute process it feeds, sits at 45 CFR Part 149 2Ref 2Office of the Federal Register (2026).45 CFR Part 149 — Surprise Billing and Transparency Requirements.The operative regulation text for the NSA's good-faith-estimate content/timing requirements and the patient-provider dispute resolution process. The nsa for office practice covers the rest of what a non-facility solo setting owes under the law, beyond the balance-billing pieces here. If an actual bill comes in well above the estimate you gave, the patient can invoke that dispute process rather than simply paying or refusing — worth knowing before the estimate goes out, not after a complaint arrives.

Where balance billing is still legal

Outside the NSA's two banned settings, a genuinely out-of-network solo practice can still bill a patient the difference between its charge and whatever the payer paid — a self-referred office visit, a patient who knowingly chose an out-of-network clinician, or a service the NSA simply doesn't reach. What makes this legal is that the patient chose out-of-network care with notice, not that the practice found a loophole.

That notice-and-consent obligation is its own, separate compliance step for the settings where it applies, and out-of-network patients generally need clear paperwork up front — a good-faith estimate, a plain statement of network status, and a record that the patient agreed to be billed on that basis. A practice that skips the notice step and simply bills after the fact is the pattern that turns a legal arrangement into a disputed one.

State law adds a second layer

The No Surprises Act sets a federal floor, not a ceiling: states can and do go further for the fully insured plans they regulate, banning balance billing in situations the federal law leaves open, particularly for HMO and managed-care patients even outside the NSA's ancillary-provider carve-out. Self-funded employer plans usually sit outside state balance-billing law entirely, governed instead by the NSA and ERISA.

Because the two layers don't move in lockstep, a bill that's legal under the federal floor can still be illegal under your state's rule, and the reverse almost never happens — state law adds restrictions, it doesn't relax the federal ones. Check your state insurance department's own balance-billing guidance for the plan type in front of you before treating an out-of-network patient as billable by default; a solo practice usually only needs to learn its own state's rule once and revisit it when the plan type changes.

Medicare and Medicaid patients: a different set of limits

Medicare and Medicaid patients carry their own balance-billing limits that don't run through the No Surprises Act at all. For a service Medicare is likely to deny as not medically necessary, you must issue an Advance Beneficiary Notice of Noncoverage before the visit to be able to bill the patient anything if Medicare denies the claim 3Ref 3Centers for Medicare & Medicaid Services (2026).Beneficiary Notices Initiative (BNI).That an Advance Beneficiary Notice of Noncoverage (Form CMS-R-131) must be issued before a likely-denied Medicare service can be billed to the patient.

Without a valid, specific ABN signed in advance, a denied Medicare claim generally can't be shifted to the patient at all — the practice absorbs it. The ABN itself (Form CMS-R-131) and the instructions for when it's required are published as part of CMS's Beneficiary Notices Initiative 3Ref 3Centers for Medicare & Medicaid Services (2026).Beneficiary Notices Initiative (BNI).That an Advance Beneficiary Notice of Noncoverage (Form CMS-R-131) must be issued before a likely-denied Medicare service can be billed to the patient, and your enrollment status with Medicare — participating, non-participating, or opted out — separately governs what you can charge a Medicare patient beyond that notice, a distinction your Medicare Administrative Contractor's own enrollment materials define for your jurisdiction 4Ref 4CGS Medicare (2026).CGS Medicare.That a Medicare Administrative Contractor's own published enrollment materials define participating/non-participating/opted-out billing limits for its jurisdiction. Medicaid rules are typically stricter still: most state Medicaid programs bar balance billing a Medicaid patient for a covered service outright, full stop.

The check before you send the bill

Before you send any out-of-network bill, run the same four checks in order: confirm the patient's network status with that specific payer, confirm neither NSA-banned setting applies, confirm you gave the required notice or good-faith estimate, and confirm your state hasn't layered on a further restriction. Skipping the order tends to surface the expensive mistake after the bill is already out, not before.

Scenario	Balance billing legal?	What controls
In-network, any payer	No	Your payer contract
Out-of-network emergency care	No, federally	No Surprises Act 1Ref 1Centers for Medicare & Medicaid Services (2026).No Surprise Billing.That the No Surprises Act bans balance billing in the emergency and in-network-facility-ancillary settings and requires good-faith estimates for uninsured/self-pay patients, with CMS hosting the implementing guidance2Ref 2Office of the Federal Register (2026).45 CFR Part 149 — Surprise Billing and Transparency Requirements.The operative regulation text for the NSA's good-faith-estimate content/timing requirements and the patient-provider dispute resolution process
Out-of-network ancillary clinician at an in-network facility	No, federally	No Surprises Act 1Ref 1Centers for Medicare & Medicaid Services (2026).No Surprise Billing.That the No Surprises Act bans balance billing in the emergency and in-network-facility-ancillary settings and requires good-faith estimates for uninsured/self-pay patients, with CMS hosting the implementing guidance2Ref 2Office of the Federal Register (2026).45 CFR Part 149 — Surprise Billing and Transparency Requirements.The operative regulation text for the NSA's good-faith-estimate content/timing requirements and the patient-provider dispute resolution process
Out-of-network elective visit, patient's own choice, notice given	Yes, generally	Notice-and-consent + your state's rule
Medicare, likely-denied service, no ABN on file	No	ABN rule 3Ref 3Centers for Medicare & Medicaid Services (2026).Beneficiary Notices Initiative (BNI).That an Advance Beneficiary Notice of Noncoverage (Form CMS-R-131) must be issued before a likely-denied Medicare service can be billed to the patient
Medicare, valid ABN signed, then denied	Yes, up to the ABN's terms	ABN rule 3Ref 3Centers for Medicare & Medicaid Services (2026).Beneficiary Notices Initiative (BNI).That an Advance Beneficiary Notice of Noncoverage (Form CMS-R-131) must be issued before a likely-denied Medicare service can be billed to the patient

Treat the table as a starting screen, not a final answer — the "yes" rows still route through your state's own balance-billing law before you can rely on them.

Common questions

Relying on a patient's assumption instead of documented notice is the exact gap the No Surprises Act's notice-and-consent and good-faith-estimate rules were built to close. Without that paperwork on file, a bill the patient didn't expect is far more likely to become a dispute, a chargeback, or a complaint to your state insurance department than a paid balance.

Only in the two settings it covers: emergency services, and non-emergency services delivered by an out-of-network clinician at an in-network facility. A solo practice billing office visits under its own roof, seen by patients who chose it directly, is usually outside both categories, which is exactly why the elective out-of-network path stays legal for that visit type.

The patient can dispute the bill through the federal patient-provider dispute resolution process created for exactly this situation, and the claim can also draw a complaint to the relevant regulator. Neither outcome is a quiet fix; both put the disputed amount, and the practice's billing pattern, in front of someone with authority to unwind it.

No. Billing for the copay, coinsurance, or deductible your payer contract specifies is ordinary cost-sharing, not balance billing; it's the amount the payer's own adjudication assigned to the patient. Balance billing is charging beyond that assigned amount, for the gap between your charge and what the contract or the law says you're allowed to collect.

No, because there's no payer allowable in the picture to exceed, so there's nothing to balance against. A self-pay patient is billed at the self-pay rate directly, subject to its own good-faith-estimate obligation under the No Surprises Act rather than the balance-billing rules that govern payer-adjudicated claims.

Run your practice on Gale

The software is free. Gale earns one flat 3.5% all-in per paid transaction — only on transactions that actually pay. No subscription, no setup fee, no network cut.

Start or manage a practice →

References

1.Centers for Medicare & Medicaid Services (2026). No Surprise Billing. Centers for Medicare & Medicaid Services (CMS). link ✓That the No Surprises Act bans balance billing in the emergency and in-network-facility-ancillary settings and requires good-faith estimates for uninsured/self-pay patients, with CMS hosting the implementing guidance
2.Office of the Federal Register (2026). 45 CFR Part 149 — Surprise Billing and Transparency Requirements. eCFR. link ✓The operative regulation text for the NSA's good-faith-estimate content/timing requirements and the patient-provider dispute resolution process
3.Centers for Medicare & Medicaid Services (2026). Beneficiary Notices Initiative (BNI). Centers for Medicare & Medicaid Services (CMS). link ✓That an Advance Beneficiary Notice of Noncoverage (Form CMS-R-131) must be issued before a likely-denied Medicare service can be billed to the patient
4.CGS Medicare (2026). CGS Medicare. Medicare Administrative Contractor portal. link ✓That a Medicare Administrative Contractor's own published enrollment materials define participating/non-participating/opted-out billing limits for its jurisdiction

https://www.gale.care/for-providers/pp-balance-billing-when-legal · 4 sources. Competitor details are cited to dated public sources and maintained as they change; figures are estimates, not commitments. Synthetic demonstration.

← Back to for providers