No Surprises Act IDR for Out-of-Network Providers: How to Dispute Low Payments and Get Paid Fairly

Out-of-network billing changed for good when the No Surprises Act took effect. For most emergency care and many services at in-network facilities, you can no longer balance bill the patient. Instead, the health plan pays what it chooses, often near its qualifying payment amount, and the federal independent dispute resolution (IDR) process is how you push back.

This guide is for out-of-network physicians, practice administrators and billing managers. It explains which claims qualify, how the QPA works, each deadline in the IDR timeline, the 2026 batching and fee changes, and the evidence that wins.

Quick answer: If a plan underpays a claim covered by the No Surprises Act, start a 30-business-day open negotiation within 30 business days of the payment or denial. If it fails, you have 4 business days to start federal IDR. A certified IDR entity then picks either your offer or the plan’s. Since June 11, 2026, the administrative fee is $15 per party.

What the No Surprises Act Covers for Out-of-Network Billing

The No Surprises Act for providers covers three kinds of out-of-network billing:

• Emergency services from out-of-network providers and facilities.
• Non-emergency services from out-of-network providers at in-network hospitals, hospital outpatient departments, critical access hospitals and ambulatory surgery centers.
• Out-of-network air ambulance services.

For these services, balance billing rules limit the patient to in-network cost-sharing. Some non-emergency providers can ask the patient to waive these protections through notice and consent. Ancillary services can never be waived, however. That group includes emergency medicine, anesthesiology, pathology, radiology, neonatology, lab work, assistant surgeons, hospitalists and intensivists.

What Falls Outside Federal IDR

• Ground ambulance services.
• Medicare, Medicaid, CHIP and TRICARE claims.
• Claims governed by a specified state law or an All-Payer Model Agreement.
• Coverage denials, which go through the plan’s appeal process instead.
• Services where the patient gave valid notice and consent.

Self-funded employer plans usually fall under federal IDR even in states with their own surprise billing law, because state law often cannot reach them. If you are unsure whether you are in or out of network, our guide to PAR vs. non-PAR providers explains the difference.

How the Qualifying Payment Amount (QPA) Is Set

The qualifying payment amount (QPA) is generally the plan’s median in-network rate for the same or a similar service in the same area in 2019, indexed for inflation. It usually sets out-of-network reimbursement far below billed charges, for three reasons:

• It is a median of discounted contract rates, not of charges.
• It starts from 2019 rates and rises only with inflation.
• The plan calculates it, so you rarely see the data behind it.

Before you send the open negotiation notice, compare the plan’s payment with the QPA it disclosed. Plans must share the QPA with the initial payment or denial, and you can ask the plan for more information about how it was calculated. That detail often shapes a stronger counteroffer.

Courts have narrowed how plans set the QPA. On August 11, 2026, the full Fifth Circuit ruled in TMA III that “ghost rates” for services a provider never performs cannot count, and that bonus and incentive payments must be included. Earlier rulings removed any presumption that the QPA is the right payment. Because these rules have changed several times, check the latest federal guidance before you rely on a QPA.

The Independent Dispute Resolution Process, Step by Step

The independent dispute resolution process runs on fixed deadlines. Miss one, and the dispute is usually lost. The steps below follow CMS’s guidance for providers and health plans.

Step 1Receive the initial payment or denial

Plans are expected to pay or deny within 30 calendar days of a clean claim. Courts struck the formal deadline, so treat 30 days as a target, not a guarantee. The remittance date starts your clock. Log it for every out-of-network claim, because each later deadline counts from it.

Step 2Open negotiation (30 business days)

Send the open negotiation notice within 30 business days of the payment or denial. The open negotiation period then runs 30 business days. Under the 2026 rule, the plan must respond by business day 15. Make a real counteroffer, because good-faith negotiation is one of the factors the IDR entity weighs later.

Step 3Start IDR within 4 business days

If negotiation fails, either party can start IDR within 4 business days after the period ends. This is the window providers miss most often.

Step 4Choose the IDR entity

The parties have 3 business days to agree on a certified IDR entity. If they do not, CMS assigns one. The entity then has 5 business days to decide whether the dispute is eligible.

Step 5Submit your offer and pay fees

Offers and supporting evidence are due within 10 business days of entity selection. Pay both fees by that deadline as well. Under the 2026 rule, a party that has not paid is treated as if it submitted no offer. Make each offer a specific dollar amount for the item or service in dispute, and keep proof of the dates you submitted the offer and paid the fees.

Step 6Decision, payment and cooling off

The entity decides within 30 business days of selection and picks one offer, with no middle ground. The losing side pays within 30 calendar days. A 90-calendar-day cooling-off period then bars new disputes between the same parties for the same service. For batched decisions with negotiation starting on or after November 1, 2026, it is 30 business days.

Batching Claims Under the 2026 Rules

For high-volume out-of-network billing, batching lets you combine similar claims into one dispute and one set of fees. For open negotiations starting on or after November 1, 2026, a batch may include up to 50 line items from one 30-business-day period, all with the same plan. Items qualify for the same batch if they share one of these traits:

• One patient and one encounter, with the same or consecutive dates of service on the same claim form.
• The same service code, or a comparable code in another code system.
• Anesthesiology, radiology, pathology or lab codes in the same CPT Category I range.

Emergency visit codes 99281 to 99285 cannot be batched across patients, and each air ambulance transport is its own dispute.

IDR Fees for 2026

Documentation That Wins IDR Disputes

The IDR entity must consider the QPA, but it also weighs credible evidence on other factors. Strong out-of-network billing teams build every offer around them:

• Training, experience and quality outcomes: board certification, years in practice, outcome data.
• Market share: your share of the local market and the plan’s.
• Acuity and complexity: why this patient took more work than a typical case.
• Teaching status, case mix and scope of services for facilities.
• Good-faith network efforts: past contract offers and contracted rates with this plan over the prior four plan years.

Watch out: The entity may not consider your usual and customary charges, your billed charges, or Medicare, Medicaid, CHIP or TRICARE rates. Offers built on billed charges alone rarely win.

Prior contract history carries real weight here. Our payer contracting guide explains how to document negotiation history before a dispute starts.

Mistakes That Make Out-of-Network Claims Ineligible

In the second half of 2025, CMS found about 19% of disputes ineligible. Most out-of-network claim denials at the IDR stage trace back to process errors:

1. Filing during a cooling-off period, the most common reason cited by CMS.
2. Filing a claim that a specified state law or All-Payer Model governs.
3. Skipping or cutting short open negotiation.
4. Missing the 4-business-day window after negotiation ends.
5. Batching items that do not meet the grouping rules.
6. Filing Medicare, Medicaid or other public program claims.
7. Paying fees late, which now counts as no offer.

One more change is coming. For services on or after January 1, 2027, plans must use standard remittance codes that show whether a claim can go to IDR. CMS also plans a new online IDR Gateway in spring 2027.

How an Out-of-Network Billing Partner Recovers Revenue

Strong out-of-network billing comes down to tracking dates and building evidence on every eligible claim. A partner that works these disputes every day can:

• Flag NSA-covered claims as soon as the remittance posts.
• Track every business-day deadline from negotiation to payment.
• Screen out ineligible claims before fees are paid.
• Build batches that meet the 2026 rules.
• Assemble offers backed by acuity, experience and contract history.
• Report results by payer, so you can see which plans underpay most often and where a new contract conversation makes more sense than repeated disputes.

The Bottom Line

Low payments on No Surprises Act claims are not final. Out-of-network billing teams that open negotiation on time, file IDR within 4 business days, batch correctly and support their offers with evidence win most disputes. The $15 fee makes even smaller claims worth disputing.

Frequently Asked Questions