The Departments rewrote the operating rules of the No Surprises Act arbitration process. Most coverage led with the fee. The fee matters — but the deadline and eligibility changes will decide more cases. Here is the whole picture, with the schedule, and what it means for a practice sitting on written-off claims.
The administrative fee is what each side pays the Departments simply to use the process, win or lose. It is separate from the certified IDR entity's fee, which the losing party pays. At $115 a side, a physician looking at a $400 underpayment could reasonably conclude the fight was not worth it. At $15, that conclusion flips — and it flips hardest exactly where the federal data says the awards are proportionally largest.
| Claim size (QPA) | Median prevailing offer vs QPA | Your cost to file, per dispute |
|---|---|---|
| Under $100 | 5.53× | $15 |
| $100 – $500 | 3.45× | $15 |
| $500 – $1,000 | 2.81× | $15 |
| $1,000 – $5,000 | 2.41× | $15 |
| $5,000 – $10,000 | 2.30× | $15 |
| $10,000 and above | 1.73× | $15 |
Multiples are the median prevailing offer as a percentage of the qualifying payment amount, Q4 2024, from the Departments' supplemental tables. They describe outcomes of disputes that reached a determination — not a promise about any individual claim. The point is directional and it is not subtle: the small claims most practices wrote off are the ones where arbitration awards land furthest above the insurer's benchmark, and they now cost $15 a side to bring.
The rule arrives in stages, and confusing them is how deadlines get missed.
| Provision | When it applies |
|---|---|
| $15 administrative fee | Disputes initiated on or after June 11, 2026 — already in force |
| Rules effective date | August 3, 2026 |
| Open negotiation, initiation, IDRE selection, eligibility review, batching | 90 days after the Departments announce the supporting portal functionality, on a rolling basis |
| Federal IDR Registry (payer registration) | 90 business days after registry-specific guidance |
| IDR Gateway platform | Late 2026, replacing single-use web forms |
The thirty-business-day negotiation window cannot begin until the notice, together with the initial payment remittance or denial, is formally submitted through the federal portal. Notices must carry more detailed claim information than before, and the responding party must reply by the fifteenth business day. Informal emails to a payer no longer start the clock.
Certified IDR entities must now determine eligibility within five business days of selection. This is the quiet headline: from April 2022 through December 2024, eligibility was challenged in 976,721 disputes and 355,804 were found ineligible. Faster decisions mean a bad filing fails fast instead of consuming a quarter.
Payers must register, so the initiating party can identify the correct plan and plan type. Misidentifying the payer or plan type has been a routine cause of ineligibility — a clerical failure that killed otherwise sound claims.
The number of certified IDR entities expands from 13 to 15. Against a backlog built on more than 5.1 million disputes submitted through January 31, 2026, extra capacity matters for how long a determination takes.
The federal IDR process runs on a chain of deadlines that are easy to miss because some are counted in business days and one in calendar days. Under 45 CFR 149.510, the sequence is fixed:
| Step | Deadline |
|---|---|
| Open negotiation period | 30 business days, running from the date the open negotiation notice is received |
| Window to initiate federal IDR | 4 business days, beginning on the 31st business day after the start of the open negotiation period |
| Determination | 30 business days after the certified IDR entity is selected |
| Payment | Within 30 calendar days after the determination is issued |
Two points deserve flagging for a revenue cycle operation.
The initiation window is four business days. After roughly six weeks of open negotiation, a team that is not tracking the count can blow through the initiation window while waiting on a payer response that never comes. The window opens on the 31st business day — put that date on the claim record the day the open negotiation notice is received, not when negotiations stall.
Business days and calendar days are not interchangeable here. The negotiation period, initiation window, and determination clock run on business days; the payment obligation runs on calendar days. A tickler system keyed to calendar days will misstate every upstream deadline in this process.
With the 2026 rules moving open negotiation initiation into the federal portal, the date the notice is formally submitted through the portal is what starts this chain. Your tracking should key off that documented date, and the same calendar discipline should govern the response deadline on the payer side — the fifteenth business day of the thirty-business-day period — because if one side pays its fees and submits an offer and the other does not, the certified IDR entity is required to rule in favor of the side that did.
Not every determination is a contested fight. In the second half of 2024, 22% of all payment determinations were default decisions, up from 16% in the first half of the year. Providers won 87% of those defaults, up from 75% the prior half.
Read that pair of numbers carefully, because it carries two separate lessons.
First, a large share of disputes ends without a full contest — one side fails to pay the administrative fee, misses a filing, or never submits an offer. In a process running at the current volume, that is a real fraction of your portfolio. A dispute you file completely is sometimes decided on the other side's non-participation, which cuts both ways: your own missed deadline converts your claim into the same statistic in the payer's favor.
Second, the provider win rate is not an artifact of defaults. Where both sides paid the fee and submitted offers — fully contested disputes — providers still won 85% in the second half of 2024, against 86% in the first half. The contested-case win rate and the overall rate sit at essentially the same level. If defaults were carrying the headline number, the contested rate would diverge from it. It does not.
For a hospital or group building a 2026 workflow, the implications are procedural, not predictive:
These figures describe aggregate outcomes for disputes that reached determination in the second half of 2024. They are the Departments' published counts, not a projection of any individual dispute's result.
Even when a dispute passes initial review, the non-initiating party can still contest whether it belongs in the federal process at all. In the second half of 2024, the non-initiating party challenged eligibility in 43% of all initiated disputes — 370,529 challenges out of 853,374. In the first half of 2024, the rate was 45%. Challenging eligibility is not an edge case in this process; it is close to the norm.
The longer trend shows the process getting cleaner but never clean: the share of disputes found ineligible ran at 69% in the first half of 2022, fell to 22% by the first half of 2023, held around 22% through 2023, and declined to 19% for 2024. The Departments themselves identify the complexity of eligibility determinations as the main cause of delays in the process.
Put the 2026 rule changes against that backdrop and a strategy emerges:
The 2026 rules do not make eligibility challenges go away; they make the consequences of filing quality arrive sooner. For a hospital revenue cycle team, that shifts the economics toward getting the initiation packet right the first time, since a defective filing now surfaces in five business days instead of a quarter.
The administrative fee cut to $15 gets the attention, but it is only one of two costs in a federal IDR dispute, and it is the smaller one when you lose.
Cost one: the administrative fee. $15 per party, per dispute, for disputes initiated on or after June 11, 2026. It is non-refundable regardless of outcome — you pay it whether you win or lose.
Cost two: the certified IDR entity's fee. Paid by the losing party. It falls within a range the Departments publish annually, and the schedule differs for single determinations versus batched determinations.
Three planning consequences follow.
Model the downside, not just the filing cost. A portfolio decision built on $15 per dispute understates exposure. If a dispute is lost, the cost is $15 plus the certified entity's fee for that determination type. Before a filing push, pull the current published fee schedule and price your worst-case per claim, not your best-case.
Batching changes the fee math. The entity fee schedule treats batched determinations differently from single ones, and the 2026 rules bring batching changes on the same rolling schedule as the other portal provisions. For a hospital sitting on a high volume of same-service-line claims, the per-dispute economics of a batch differ from a series of singles — run both models against the current published schedule before choosing.
Volume makes the fee schedule material. With 698,968 determinations issued in the second half of 2024 alone, entity fees are a functioning market, and the Departments adjust the published range annually. A fee schedule pulled for last year's planning is stale; verify the current figures as part of each filing cycle.
None of this predicts any dispute's outcome. It sets the input side of the decision: what a claim costs to bring, what it costs if it loses, and how batching shifts both numbers.
$15 per party per dispute, for disputes initiated on or after June 11, 2026. It was $115. The fee is set by the Departments and is non-refundable regardless of who wins.
The final rules were issued on May 28, 2026 and published in the Federal Register on June 4, 2026. They are effective August 3, 2026, but the lower administrative fee applies earlier — to disputes initiated on or after June 11, 2026. Several procedural provisions apply later, on a rolling basis as portal functionality becomes available.
Yes, arithmetically. At $115 per party a small-dollar claim often cost more to dispute than it could recover. At $15 that threshold drops sharply, and CMS data shows the largest award multiples relative to the QPA occur on the smallest claims.
Open negotiation must now be initiated through the federal IDR portal rather than by any means the parties choose, the notice must carry more detailed claim information, and the responding party must reply by the fifteenth business day of the thirty-business-day period.
Certified IDR entities must complete eligibility determinations within five business days of selection. Eligibility has been the single largest source of loss in the process: between April 2022 and December 2024, parties challenged eligibility in 976,721 disputes and 355,804 were found ineligible.
This page explains a federal rule. It is not legal advice, and it does not predict the outcome of any individual dispute.