How do I write a No Surprises Act dispute letter?

State that you believe the bill violates the NSA, name the date of service, facility, and claim number, and compare the provider bill to your EOB in-network cost-sharing. Ask for withdrawal of amounts above that cost-sharing and cite 45 CFR Part 149. Send copies to the billing office and your plan.

Does the No Surprises Act apply to my ER visit?

Usually yes for emergency services, including when the ER doctor is out of network at an in-network hospital. You still owe in-network cost-sharing. Confirm with the EOB and the facility's network status.

What is the prudent layperson standard?

Emergency coverage is judged by whether a reasonable person would think they needed emergency care based on symptoms, not only the discharge diagnosis. Chest pain that turns out to be reflux can still be an emergency presentation.

How long do I have to dispute a surprise medical bill?

The NSA does not set one federal consumer deadline like ERISA's 180-day appeal clock. Act before collections start and use the plan appeal deadline on the EOB if cost-sharing is wrong. Keep dated copies of every dispute.

Can they send me to collections?

Providers should not balance-bill protected amounts. If a collector contacts you, dispute in writing, send the NSA dispute, and consider a CMS complaint. Do not ignore notices.

Is air ambulance covered?

The NSA includes air ambulance surprise billing protections. Most ground ambulance bills are outside that federal framework; some states regulate ground ambulance separately.

What if I signed a consent form?

Notice-and-consent waivers are limited. They generally cannot be used for emergency services or for certain ancillary specialists. If you signed under pressure in the ER, say so in the dispute and keep a copy of the form.

Do I still appeal with my insurer?

Yes if the plan processed the claim wrong, for example treated emergency care as non-emergency or applied out-of-network rates. That is a plan appeal. The provider dispute is separate.

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No Surprises Act dispute letter generator

Dispute out-of-network ER or facility balance bills under federal protections.

A No Surprises Act dispute letter challenges balance bills when emergency care or certain non-emergency care at an in-network facility involved an out-of-network clinician. Federal rules under 45 CFR Part 149 generally limit you to in-network cost-sharing and bar most surprise balance bills for protected services. Send a written dispute to the billing office with your EOB, cite the NSA, and ask that charges above in-network cost-sharing be withdrawn.

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Complete guide

How to dispute a surprise ER or out-of-network facility bill

Use the No Surprises Act dispute letter generator above with your bill and EOB details.

How this tool works

You enter denial facts from your EOB or denial letter — member ID, claim number, service, and the reason the payer gave.
AppealFlow drafts structured appeal language you can edit in the browser. Optional checkboxes add ERISA full-and-fair-review language, No Surprises Act references, or expedited-review requests when they fit your facts.
Export PDF or Word, keep a copy for your records, and file through the portal, fax, or mailing address on your notice before the deadline printed there.

Internal appeals ask the plan to reconsider its own adverse benefit determination. You are not debating fairness in general — you are showing why the decision failed the plan's medical policy, authorization rules, or billing edits.

Keep a single timeline document with denial date, appeal submission date, follow-up calls, and any additional information requests. This record supports state department complaints if the carrier misses required response times under 29 CFR 2560.503-1 or state analogs.

When clinical criteria are cited, request the plan medical policy the reviewer used. You may obtain it through member services or a written request. Compare each criterion to your chart note rather than quoting internet summaries.

Who this is for

People billed extra after an ER visit at an in-network hospital
Patients billed by an out-of-network anesthesiologist, radiologist, or hospitalist in a network facility
Air ambulance surprise bills, since the NSA covers air ambulance balance billing
Members whose plan processed emergency care at out-of-network rates on the EOB

Elective out-of-network care you chose with a valid notice-and-consent form is often not protected
State surprise-billing laws may add protections; they do not replace checking whether NSA applies

Step-by-step workflow

Step 1: Compare the bill to the EOB
Your in-network deductible, copay, and coinsurance should match the EOB for protected services. A provider bill for the remainder is the typical surprise balance bill. Note the claim number, allowed amount, and what you already paid.
Step 2: Check NSA coverage facts
Emergency services and many post-stabilization services are protected. Non-emergency OON care at an in-network facility is protected unless you gave, and were allowed to give, informed consent to waive protections under 45 CFR 149.120.
Step 3: Dispute in writing
Tell the provider you believe the charge violates the No Surprises Act, request an in-network cost-sharing-only bill, and include member ID, date of service, and claim number. A dated dispute letter starts your paper trail.
Step 4: Copy the plan and keep the paper trail
Plans also have NSA duties. Send a copy to your insurer if cost-sharing looks wrong on the EOB. If collections start, dispute the debt in writing and keep certified-mail receipts.
Step 5: Appeal with the health plan if cost-sharing is wrong
If the plan treated emergency care as non-emergency or applied out-of-network rates, file a plan appeal using the deadline on the EOB. The provider dispute and the plan appeal are separate tracks that can run together.
Step 6: Use the CMS help desk if the bill continues
CMS No Surprises Help Desk: 1-800-985-3059. File a complaint at cms.gov/nosurprises. Independent Dispute Resolution is mainly a provider-payer process; consumers still use complaints and plan appeals for cost-sharing errors.

Worked example: estimating a 180-day internal window

Your commercial plan sends an adverse benefit determination dated March 15, 2026 denying physical therapy as not medically necessary. The notice says you may request an internal appeal within 180 days.

Adding 180 calendar days to March 15 lands on September 11, 2026 (verify with your plan — some policies use business days or a fixed date on the form). If you need continued care while waiting, ask whether the plan offers an expedited review and document any worsening symptoms.

If the internal appeal is upheld, the same notice often explains whether you may request external review and which state or federal program applies. Save portal uploads, fax confirmations, and certified mail receipts.

Appeal deadlines by plan type (reference)

Deadlines are plan-specific. The table summarizes common federal frameworks cited on many notices. Your adverse benefit determination letter controls filing dates and channels.

Plan type	Internal appeal	External review	Urgent / expedited
ACA marketplace / fully insured individual & small group	Often 60–180 days from the adverse determination (check notice). ACA internal claims and appeals rules require written notice of rights.	After exhausting internal appeals, many enrollees may request external review; federal rules set minimum external review rights for qualifying plans (see 45 CFR 147.136).	Urgent medical situations may qualify for expedited review; many plans must respond within 72 hours when delay could seriously jeopardize health (45 CFR 147.136(b)(3) framework).
Self-funded employer plan (ERISA)	29 CFR 2560.503-1 requires a reasonable opportunity for a full and fair review; many plans allow about 180 days to request review of an adverse benefit determination unless the plan document grants longer.	External review rights depend on plan design and state law for insured portions; many ERISA plans use independent review vendors after internal exhaustion.	Expedited review must be available when the timeframe for a standard review could seriously jeopardize life or health (29 CFR 2560.503-1(h)(3)(i)).
Original Medicare (Part A & B)	Medicare uses redetermination (Level 1) by the Medicare Administrative Contractor — typically 120 days from the date of the initial determination on the MSN.	Reconsideration (Level 2), ALJ hearing, and further levels follow CMS Medicare appeals guidance — not the same clocks as commercial insurance.	Expedited Medicare determinations exist for certain hospital and SNF situations; follow instructions on the MSN.
Medicare Advantage (Part C)	Organization determination and plan-level appeals follow CMS Medicare Advantage rules; use the plan's forms and clocks on the denial.	After plan-level appeals, enrollees may request CMS review or, for some issues, state external review when applicable.	Part C plans must offer expedited reviews for urgent requests per CMS marketing/appeals requirements.
Medicare Part D (prescription drugs)	Coverage determinations and exceptions use PBM/plan Part D forms; standard determination timeframes are set in CMS Part D regulations.	Appeal to the Independent Review Entity (IRE) after plan-level denial of a standard or expedited determination.	Expedited exceptions and appeals exist when waiting could seriously harm health; request expedited processing in writing.
Medicaid / CHIP (state)	Each state Medicaid agency sets fair hearing and appeal timelines; use the notice from your managed care plan or state agency.	State fair hearing after managed care appeal exhaustion; timelines vary by state and benefit type.	Many states allow expedited hearings when delay would jeopardize health; cite urgency on the request form.

Cite 29 CFR 2560.503-1 for many ERISA group health plans and 45 CFR 147.136 for many non-grandfathered individual/small group plans. Medicare and Medicaid use separate statutes and forms.

Documents to gather

Itemized provider bill
Explanation of Benefits
ER or facility records showing emergency or in-network facility
Any Notice and Consent form you were given, or a statement that you were not
Proof of payment already made toward in-network cost-sharing
Health plan ID card and member ID

NSA consumer disputes are not the same as a 180-day ERISA claim appeal. Act quickly before collections. Plan cost-sharing errors still follow the appeal deadline on the EOB.

Weak vs strong wording

Weak

This bill is unfair. I had an emergency.

Stronger

Date of service [date] was emergency care at in-network [facility]. Out-of-network [specialty] balance bill of $[x] exceeds in-network cost-sharing on EOB [claim #]. Request withdrawal of balance billing under 45 CFR 149.110.

Name the facility network status, the protected service type, and the EOB numbers.

Weak

I should not have to pay the anesthesiologist because the hospital was in network.

Stronger

Surgery at in-network [facility] on [date]. Anesthesiologist billed $[x] above in-network cost-sharing of $[y] per EOB [claim #]. Service qualifies as non-emergency care by an OON specialist at an in-network facility without valid consent. Request revised bill limited to in-network cost-sharing.

Facility-based OON specialist bills are a core NSA use case when consent was not valid.

Weak

Please remove this air ambulance charge.

Stronger

Air ambulance transport on [date] from [origin] to [destination] for [emergency indication]. Billed amount $[x]; member responsibility should be limited to in-network cost-sharing per EOB. Cite NSA air ambulance protections under 45 CFR Part 149 and request withdrawal of balance bill.

Air ambulance is federally protected; ground ambulance is mostly outside the NSA and needs a different argument.

Common mistakes

Paying the balance to make it go away without a written reservation of rights
Assuming all ambulance bills are covered by the NSA. Ground ambulance generally is not federally protected.
Ignoring a signed consent form that may have waived protections for a scheduled OON provider
Only disputing with the provider when the EOB shows wrong cost-sharing and a plan appeal is also needed

What to do next

Save proof of filing (portal screenshot, fax confirmation, or certified mail receipt).
If the plan requests more records, respond within the timeframe on the follow-up letter.
When internal appeals are exhausted, read your notice for external review or state complaint rights.
Need deadlines, evidence lists, and filing checklists in one download? Consider the matching AppealFlow pack on the pricing page (document prep only).
Optional paid pack: Appeal Pack (document preparation only).

Authoritative sources

Related tools and guides

FAQs

Generate your NSA dispute letter with the tool above, send it to the billing office, and keep copies. Call CMS at 1-800-985-3059 if balance billing continues.

Free draft tool · Review with your clinician · Not legal or medical advice · Disclaimer