Surprise Billing in Massachusetts: Rules, Gaps, and Disputes

If you receive a surprise medical bill in Massachusetts, you generally owe no more than your in-network cost-sharing when an out-of-network provider treated you at an in-network facility or you needed emergency care, thanks to Chapter 176O of the Massachusetts General Laws working alongside the federal No Surprises Act. The insurer, not you, is responsible for sorting out the balance with the provider. How fully you are protected depends on whether your health plan is fully insured under state law or self-insured under federal ERISA rules, and on a few specific gaps worth knowing about before you pay anything.

What You Owe When an Out-of-Network Provider Treats You

The core state rule is in Chapter 176O, Section 6. Your insurer must cover medically necessary services at an in-network facility even when part of your care is delivered by an out-of-network provider, as long as you did not have a reasonable opportunity to choose an in-network provider instead. You pay only what you would have paid in-network. The insurer absorbs the rest.¹

This is the situation that produces most surprise bills. An anesthesiologist, radiologist, or pathologist working at your in-network hospital may be out-of-network without your knowing. Under Massachusetts law, that becomes the insurer’s problem to resolve with the provider, not yours to pay.

The same law also requires in-network cost-sharing when the service you need is not available from any in-network provider. If your plan has no network specialist who performs the procedure, the insurer must cover an out-of-network provider at in-network cost levels.¹

Emergency Care

Your insurer cannot require prior authorization for emergency services and must cover them whether the provider or facility is in-network or not.² Under both state and federal law, your cost-sharing for emergency care is capped at what you would pay at an in-network facility. An out-of-network ER visit should cost you the same copay, coinsurance, or deductible amount you would face in-network.³

The federal No Surprises Act extends this protection to post-stabilization services. Once you are stabilized in an emergency department, continued treatment at that facility remains protected from balance billing in most circumstances.⁴

The 72-Hour Notice Rule for Scheduled Care

For non-emergency care, Massachusetts adds a timing requirement. A provider or facility can only ask you to consent to out-of-network treatment if it informed you about the availability of an in-network alternative at least 72 hours before the scheduled service. The provider must also give you a good faith estimate of your share of the costs.³

If a hospital tells you the day before surgery that your anesthesiologist is out-of-network and hands you a consent form, that 72-hour window has not been met. You keep your balance billing protections in that scenario.

When a Provider Can Ask You to Waive Protections

A provider can only seek your written consent to waive balance billing protections in two narrow situations, and consent must be documented in writing before treatment.

For non-emergency services at an in-network facility, consent can be requested only when the service is not classified as ancillary and the need for it was not unforeseen or urgent.⁵ For post-stabilization services after an emergency, consent can be requested only if you are stable enough to travel to an in-network facility, mentally capable of receiving information and giving informed consent, and given proper written notice.⁴ If you need medical transportation, including an ambulance, you are considered unable to give consent and no waiver is valid.

Certain services can never be waived. These ancillary services include anesthesiology, pathology, radiology, neonatology, diagnostic services, and care from assistant surgeons, hospitalists, and intensivists. If no in-network provider is available for a service at the facility, that service is also always protected.⁴ A provider pressuring you to sign a waiver for anesthesia, radiology, or pathology is violating the law.

Gaps You Should Know About

Ground Ambulance

Ground ambulance services are excluded from the federal No Surprises Act’s balance billing protections. As of 2026, no federal legislation has closed this gap. Whether you are protected from a ground ambulance balance bill depends on state law and your specific plan terms. This is one area where a surprise bill can still land on you even after doing everything right.

Air Ambulance

If your health plan covers air ambulance services, the federal law caps your cost-sharing at in-network levels and requires payments to count toward your in-network deductible and out-of-pocket maximum, even when the provider is out-of-network.⁶ If your plan does not cover air ambulance at all, this protection does not apply.

Self-Insured Employer Plans

Chapter 176O applies to fully insured health plans licensed in Massachusetts. It generally does not apply to self-insured employer plans governed by ERISA, which many large employers use. The federal No Surprises Act fills most of this gap: self-insured plans are subject to the same balance billing caps for emergency and covered non-emergency out-of-network services.⁷ The difference shows up in complaints and appeals, because the responsible agency and process depend on plan type. If you are not sure which type you have, ask your employer’s benefits department or call the number on your insurance card.

If You Are Uninsured or Paying Out of Pocket

The federal No Surprises Act gives self-pay and uninsured patients the right to a good faith estimate of expected charges before care. When you schedule a service at least three business days out, the provider must deliver the estimate within one business day of scheduling. If you schedule 10 or more business days ahead, they have three business days. You can also request an estimate at any time, even without scheduling, and the provider must respond within three business days.⁸

The estimate must include an itemized list of expected services and charges grouped by provider or facility, with applicable diagnosis and service codes. If anything changes before your appointment, the provider must send an updated estimate at least one business day before the service.⁸

If the final bill exceeds the good faith estimate by $400 or more for any single provider or facility, you can start the federal Patient-Provider Dispute Resolution process. You must file within 120 calendar days of receiving the bill. The administrative fee is $25, and you can recover it if the decision goes in your favor.⁹

How to Dispute a Surprise Bill in Massachusetts

External Review Through the Office of Patient Protection

The Office of Patient Protection, part of the Massachusetts Health Policy Commission, administers external review for health insurance denials. If you received a surprise bill and your insurer has not complied with federal surprise billing rules, you may be eligible for external review. The decision is final and binding, and over 40 percent of reviews are resolved in the patient’s favor. This route is available only for fully insured plans licensed in Massachusetts. Self-insured plans use their own external review process or a federal route.¹⁰

Complaint to the Division of Insurance

You can file a complaint directly with the Massachusetts Division of Insurance through its online submission form, by email at CSSComplaints@mass.gov, or by phone at (877) 563-4467 (Option 2).³ Use this route when the insurer is the problem, such as when it applied out-of-network cost-sharing to a service that should have been billed at in-network rates.

Federal Contacts

If you believe your rights under the No Surprises Act have been violated, you can contact the Centers for Medicare and Medicaid Services at 1-800-985-3059 or through the federal complaint portal.³ Providers and facilities that violate the law’s balance billing prohibitions face civil monetary penalties of up to $10,000 per violation.¹¹

Document Everything Before You Pay

Enforcement agencies rely on patient complaints. Keep the good faith estimate or any pre-service notice, the explanation of benefits from your insurer, the bill you received, and notes from every call with the provider’s billing department. If a provider asked you to sign a waiver, keep the form and note when you received it relative to the service date. Those records are what an agency needs to act, and they are also what protects you if the provider sends the bill to collections while a dispute is pending.

1
General Court of Massachusetts. Massachusetts General Laws Chapter 176O, Section 6
2
General Court of Massachusetts. Massachusetts General Laws Chapter 176O
3
Commonwealth of Massachusetts. Federal No Surprises Act Resources and Consumer Disclosures
4
CMS. The No Surprises Act’s Prohibitions on Balance Billing
5
CMS. When the Notice and Consent Exception Applies and When it Doesn’t: Guidelines for Use
6
U.S. Department of Labor. Avoid Surprise Healthcare Expenses: How the No Surprises Act Can Protect You
7
CMS. State Surprise Billing Laws and the No Surprises Act
8
eCFR. 45 CFR 149.610 – Requirements for Provision of Good Faith Estimates of Expected Charges for Uninsured (or Self-Pay) Individuals
9
CMS. No Surprises Act Good Faith Estimates and Patient Provider Dispute Resolution Requirements
10
Massachusetts Health Policy Commission. Request an External Review of a Health Insurance Decision
11
Office of the Law Revision Counsel. 42 U.S. Code 300gg-134 – Enforcement