Good Faith Estimates: When the $400 Rule Actually Wins

What a Good Faith Estimate Is and Who Must Provide One

A Good Faith Estimate (GFE) is a written document that tells you — before you receive a scheduled service — the expected total cost of that service. The requirement was created by the No Surprises Act, which took effect January 1, 2022.

Providers are required to give a GFE to:

• Patients who are uninsured (have no health coverage at all), OR
• Patients who are self-pay for a specific service — meaning they have insurance but choose not to use it for that particular visit or procedure

The GFE must be provided within specific timeframes: at least 3 business days before the service if it's scheduled 3 to 9 days in advance, or at least 10 business days before if it's scheduled 10 or more days out. If you schedule same-day, the provider must give you a GFE as soon as reasonably possible before service.

The GFE must include itemized expected charges for all items and services associated with the scheduled care — including the primary provider, any co-providers like anesthesia or radiology, and facility fees if applicable. It is a legal document, not a courtesy estimate.

A GFE is not a price guarantee

This is the part most patients misunderstand. A GFE is not a price lock. Actual costs can exceed GFE estimates when there are medically necessary services added during care that couldn't be anticipated beforehand — a complication during surgery, an unexpected lab result that requires additional testing, or a change in clinical circumstances.

But the $400 threshold exists precisely to give you a path when the gap between estimate and final bill isn't explained by genuine medical necessity. If the final bill exceeds the GFE by $400 or more, you have the right to dispute.

Context on why this rule matters: the CFPB has noted that up to 49% of medical bills contain at least one error. AARP research found the average overcharge on hospital bills over $10,000 runs approximately $1,300. The GFE dispute process is one of the few federal mechanisms that gives self-pay patients a structured way to challenge those gaps before paying.

The $400 Rule: What It Means and How to Measure It

The rule is simple in concept: if the total billed amount for a scheduled service is $400 or more above the total expected charges on your GFE, you can initiate the CMS patient-provider dispute process.

How to calculate the gap

Pull out your GFE document and your final itemized bill. Add up the total expected charges on the GFE for the same services. Add up the total billed charges on the final bill for those same services. If the final bill total is $400 or more above the GFE total, you meet the threshold.

Important: compare the total for the same set of services. If you had additional services performed that weren't on the GFE because they were genuinely unforeseeable, those may be excluded from the comparison. The dispute covers the gap in the originally estimated services — not legitimately unexpected additions.

The $400 applies per GFE, not per line item

Individual items on a GFE can vary. What triggers the dispute right is when the aggregate total on the final bill exceeds the aggregate GFE total by $400 or more. A single line item that's $200 above the GFE estimate doesn't trigger the rule by itself — unless the total adds up.

Who Can Use the CMS Dispute Process

The CMS patient-provider dispute process is specifically for:

• Uninsured patients who received a GFE for a scheduled service
• Self-pay patients (insured patients who chose not to use insurance for a specific service)

If you used your insurance for the service, the dispute process does not apply. Instead, you would use your insurer's internal appeal and external review process. See our EOB reading guide for more on the insured dispute path.

Emergency care is generally excluded from the GFE requirement — providers cannot be expected to provide a cost estimate before treating an emergency. However, if you received unexpected non-emergency services during an emergency visit and those services came with a separate bill substantially above any estimate provided, that's worth discussing with the billing department or BillBusted's Full Audit team.

How to File a Dispute: Step by Step

Step 1: Gather your documents

You need: (1) a copy of the Good Faith Estimate from the provider, and (2) the final itemized bill. If you don't have an itemized bill, request one now using the BillBusted itemized bill request tool — you need the itemized version to make a line-by-line comparison.

Step 2: Verify the $400 threshold

Compare the total on the GFE to the total on the final itemized bill. Confirm the gap is $400 or more. Write down the specific dollar difference — you'll cite it in the dispute filing.

Step 3: File through the CMS dispute portal

CMS administers the patient-provider dispute process through its No Surprises Act online portal. File at cms.gov/nosurprises (Patient Dispute Resolution portal). The filing fee is $25, payable by card. You'll upload your GFE and your final bill as supporting documentation and briefly describe the discrepancy.

You can also find the dispute process details and direct portal links at BillBusted's Good Faith Estimate dispute page.

Step 4: Notify the provider you've filed

Once you've filed, notify the provider's billing department in writing (email or certified mail) that a CMS patient-provider dispute has been initiated and that collection activity must stop. Reference the dispute filing date and case number if available.

Step 5: Do not pay the disputed amount while the case is open

Paying the full bill while a dispute is pending may be treated as acceptance of the billed amount. If the provider's billing department presses for payment, tell them the dispute is open and you are complying with the CMS process. You are not refusing to pay — you are exercising a federal right.

What Happens After You File

Once the CMS dispute is filed, the provider has 10 business days to respond. There are two possible outcomes at that stage:

The provider agrees to adjust the bill

In many cases, providers settle before going to arbitration. The provider may agree to reduce the bill to the GFE amount, or to the amount originally estimated for the disputed items. CMS encourages this resolution and will close the case as resolved. If this happens, get the adjusted bill in writing before the case closes.

The case goes to independent dispute resolution

If the provider doesn't agree to adjust, CMS assigns a Certified Independent Dispute Resolution Entity (CIDRE) — a neutral third party — to review the GFE and the final bill. The arbitrator reviews the documentation and issues a binding determination. The arbitrator's options are: find in favor of the patient (bill must be reduced to at or near the GFE amount), or find in favor of the provider (you owe the billed amount).

According to JAMA Health Forum, 74% of patients who dispute a medical bill receive a correction or reduction. While the GFE arbitration process has different mechanics than a standard billing dispute, the principle holds: most disputes that reach a neutral reviewer produce a favorable patient outcome.

Timeline

From filing to a binding decision typically takes 30 to 60 days. More complex cases can take longer. While the case is open, the provider cannot collect on the disputed amount.

Collection Activity and Your Rights While Disputing

The No Surprises Act is explicit: providers cannot initiate or continue extraordinary collection actions on the disputed amount while a patient-provider dispute is open. That includes:

• Reporting the balance to a credit bureau
• Selling the debt to a collections agency
• Filing a lawsuit
• Placing a lien on property

If the provider violates this while your dispute is open, that is a reportable violation. Contact the No Surprises Help Desk at 1-800-985-3059 and document everything in writing. BillBusted's Full Audit provides a full escalation plan for cases where providers don't follow the rules.

What to Do If You Never Received a GFE

Providers are required by law to offer GFEs to uninsured and self-pay patients for scheduled services. If you never received one, you have a few options:

Request one retroactively

Ask the provider's billing department for a copy of the GFE they were required to provide. Some providers generate them but fail to deliver them properly. If a GFE exists in their system, request it in writing.

File a No Surprises Act complaint with CMS

If the provider cannot or will not produce a GFE, you can file a complaint with the No Surprises Help Desk at 1-800-985-3059 or through cms.gov. CMS can investigate and sanction providers who fail to provide required GFEs.

Use the itemized bill request as a baseline

If no GFE exists and the bill looks inflated, your fallback is to request an itemized bill, look up public standard-charge and code-reference data for each CPT code, and argue for a reduction based on pricing reasonableness. BillBusted's Full Audit includes a deterministic CPT / Medicare-reference benchmark check and a hospital price-transparency checklist that can support this argument even without a GFE. For more context on that process, see our guide on medical bill negotiation scripts.