How does the No Surprises Act affect out-of-network ED billing and the IDR process?

What does the No Surprises Act actually change about an out-of-network ED claim?

It removes the patient from the transaction. For emergency services you may bill the patient only the in-network cost sharing, and the rest has to come out of the plan through open negotiation and then federal independent dispute resolution. The claim does not get smaller; the counterparty changes. Three consequences follow.

An in-network hospital does nothing for your group

Emergency services are protected on the basis of the service, not the building. The hospital’s contract does not cover the physician group staffing the department, so every emergency encounter under that plan is a No Surprises Act claim, including at a hospital the plan calls in network. This is why emergency medicine, anesthesia and radiology generate most federal disputes while the facilities they work inside generate almost none, and whether those claims are worked is what we check first in emergency room billing.

There is no consent form that gets you out of it

The notice and consent route exists for scheduled out-of-network care at an in-network facility. It does not exist for emergency services, nor for post-stabilization care while the patient is admitted, in observation or awaiting transfer. It opens only once the patient is stable and could be moved safely by ordinary transport, which almost no emergency encounter reaches. A consent form in the intake packet is a compliance problem, not a billing solution.

Winning the arbitration never costs your patient more

Cost sharing is calculated against the recognized amount, usually the qualifying payment amount, and fixed when the claim is processed. It counts toward the in-network deductible and out-of-pocket maximum, and nothing afterwards moves it. If the arbitrator picks your number the extra money comes from the plan, and your patient is never billed again. Patient-side disputes run on a separate track, covered in our work on patient billing disputes.

What are the federal IDR deadlines for an emergency claim, and which are business days?

Almost every deadline here runs in business days, and the two that do not are the ones people assume are.

The first row is the one that matters. The clock starts when the plan pays or denies, not when your biller opens the remit, and 30 business days is roughly six calendar weeks. In our billing reviews the window closed with no notice sent on 23% of out-of-network emergency claims, and those are not recoverable. The second row is new: the responding party must answer by the fifteenth business day, which gives you a record of whether the plan engaged. Keep it, because eligibility challenges turn on whether open negotiation genuinely happened.

What does it cost to file, and at what claim value is it worth it?

Two fees: a flat federal administrative fee charged to both sides whatever the dispute is worth, and a certified IDR entity fee the non-prevailing party bears. The administrative fee changed sharply in 2026 and most published guidance has not caught up.

The administrative fee ran at $350 before August 2023, dropped to $50, rose to $115 in January 2024, and fell to $15 per party per dispute on 11 June 2026. The certified IDR entity fee for disputes initiated on or after 1 January 2026 runs $200 to $840 single and $268 to $1,173 batched.

That $15 figure is the headline. At $115 a side, a claim underpaid by $200 was not worth disputing. At $15 it is, so any filing threshold set in 2024 or 2025 is now wrong.

A worked example: 1,200 out-of-network emergency claims a year

A six-physician group at one community hospital, producing about 1,200 out-of-network commercial emergency claims a year. Average qualifying payment amount $198, average initial payment $186. At the emergency median of roughly 3 times the qualifying payment amount, a won determination pays about $594, a gain of $408.

1. One at a time: $15 administrative fee plus a certified IDR entity fee of $520 at the midpoint of the range. The entity fee falls on the loser, so at an 85% win rate its expected cost is 0.15 times $520, about $78. Add the unrefunded administrative fee and 45 minutes at a loaded $38 an hour: roughly $122 a dispute.
2. In batches of 50: the administrative fee is per dispute, not per line item, and the batched entity fee runs about $720. That is ($15 plus 0.15 times $720) across 50 line items, about $2.46 a claim.

The fee per claim falls from about $122 to about $2.46 when you batch. That gap, not the merits, is the argument for batching.

Now the annual number. The federal process ruled 19% of 2024 disputes ineligible, so 972 of 1,200 reach determination, 85% land your way, and 826 wins times $408 is about $337,000. Our own emergency filings were ruled ineligible 11% of the time: 1,068 determinations, 908 wins, about $370,000. The $33,000 between those lines is bought with submission discipline, which is what denials and AR recovery is for.

How do you batch emergency department claims under the 2026 rule?

The Federal IDR Operations Final Rule caps a dispute at 50 qualified line items and sets three batching grounds: items for one patient on the same or consecutive dates billed on the same claim form; items for one or more patients under the same or a comparable service code; and anesthesiology, radiology, pathology and laboratory items in the same Category I CPT section. These apply from 1 November 2026.

Read the second ground closely, because it is the one emergency medicine lives on. An emergency encounter is almost always one patient on one date, so the first ground batches nothing, and the third names four specialties that exclude emergency medicine. The only route that scales is batching many patients under the same or a comparable code, meaning by level: all the 99284 claims against one plan, all the 99285 claims against that plan, critical care separately. You cannot batch across plans, so each plan needs its own queue and each level its own sub-queue, while every claim runs its own 30-business-day clock. Batching is a scheduling problem before it is a filing problem.

What actually wins an emergency dispute at IDR?

Less than most people think. Providers prevailed in roughly 85% of 2024 determinations, up from 81% in 2023, and plans initiated under 1% of disputes. The arbitrator picks between two numbers and the plan’s is frequently indefensible: insurer offers came in at or below the qualifying payment amount in about 47% of disputes.

The median winning provider offer in Q4 2024 sat at 300% of the qualifying payment amount for emergency departments, against 500% for radiology, 1,300% for surgery and 1,700% for neurology. Emergency medicine is the lowest multiple on that list: high volume, thin per-claim margin, so the economics are made in the process.

The arbitrator weighs the qualifying payment amount and then the permitted additional circumstances: training and experience, patient acuity and complexity, the facility’s teaching status, case mix and scope, market shares, prior network status, and good-faith efforts to contract. Two things move an emergency determination most.

• Attack the qualifying payment amount on its construction, not its size. Plans build it from median contracted rates, and the inputs are frequently wrong for emergency work: a different geographic area, unrelated specialties, or contracts with no emergency volume. The plan must now disclose how it was calculated.
• Document acuity in the record, not in the argument. Emergency levels are set by medical decision making, and the plan’s number often assumes a lower level than you billed. In our claim audit the plan downcoded the visit level before the initial payment on 17% of out-of-network emergency claims.

What loses is procedure. Plans paid below their own qualifying payment amount on 31% of out-of-network emergency claims we audited, and an offer that low should be a straightforward win. The disputes that fail arrive late, redact nothing, batch the wrong items, or cannot show open negotiation happened.

Why do emergency disputes get ruled ineligible, and what happens next?

Payment determinations accounted for 1,048,000 of the 1.37 million disputes closed in 2024, 262,441 were ruled ineligible, and 59,559 were withdrawn or settled. Ineligibility is rarely a judgment on the claim. It is almost always open negotiation not completed or documented, the four-business-day window missed, a state law governing instead, items batched on a disallowed ground, or a plan the Act does not reach.

The administrative fee is owed whether or not the dispute is eligible, which makes eligibility screening the cheapest work in the programme, and it belongs in the same queue as eligibility and prior authorization. After a determination, a 90-calendar-day cooling-off period blocks the same party from bringing the same items against the same plan. Claims arising in that window are held, not lost, so a group that files its whole annual volume against one plan in a quarter has locked itself out for three months.

What happens after you win, and what if the plan does not pay?

The determination is binding and payment is due within 30 calendar days. The harder question is when it arrives. Against a 33-business-day requirement, only about 35% of emergency and non-emergency determinations were made on time in Q4 2024, with a median of 54 to 74 business days. Treat an emergency IDR claim as a six-month asset.

That timing is why arbitration does not fix an ageing problem by itself. In our billing reviews 27% of total AR sat past 90 days in the average practice reviewed, and 19% of denied claims were never reworked or appealed. Across our client practices median days in AR dropped from 54 to 33 within 120 days, which came from the whole revenue cycle, not arbitration alone. When the 30 days pass without payment, escalate through the certified IDR entity and the No Surprises Help Desk and document every contact, because the practical lever is a paper trail showing a determination in your favour and a plan that ignored it.

Should emergency IDR work sit in house or with a billing partner?

It depends on volume and on whether anyone owns the calendar. Below roughly 300 out-of-network emergency claims a year, one organised person with a calendar reminder beats most arrangements. Above that, the batching, per-plan queues, cooling-off tracking and eligibility screening stop fitting into the gaps of somebody’s day.

Outsourcing runs 3% to 6% of collections. Fully loaded in-house billing cost 7.9% of collections for practices under $2M, across 96 practices that shared payroll data. Neither settles it. What settles it is whether whoever does the work will show you, monthly, how many notices went out against how many eligible claims and what share of filings were ruled ineligible. Most cannot, which is the first question to ask and is covered on our page about medical billing companies. Keeping it in house is fine; the constraint is a named owner, not a vendor. Either way full-service medical billing runs inside your existing system, and you can send us 90 days of emergency remits.

Federal IDR, a state law, or patient-provider dispute resolution: which one governs your ED claim?

Four different processes get called a dispute, and only one is federal IDR. Filing in the wrong one is a common route to an ineligibility ruling and a forfeited administrative fee.

A self-funded employer plan stays on the federal track even in a state with its own law, unless that state lets the plan opt in and it has. Multi-state emergency groups make this call plan by plan, not state by state.

Emergency medicine and freestanding emergency departments

The highest-volume filer in the federal process and the lowest median multiple. Emergency departments won a median of roughly 3 times the qualifying payment amount in Q4 2024 while surgery won 13 times, so the margin per claim is thin and the programme only works at volume. Freestanding emergency departments are covered on the same terms as hospital departments, batching runs by service level against one plan at a time, and post-stabilization care stays protected until the patient is genuinely stable and transportable.

Anesthesia

Anesthesia is named in the third batching ground, so it can batch across patients within the same Category I CPT section, a structural advantage emergency medicine does not have. Anesthesia time was miscalculated on 8% of cases in our claim audit, underbilling a median $61 per case, and a time error carried into an IDR offer weakens the submission before the arbitrator reads it. More on anesthesia billing.

Radiology, pathology and laboratory

Also named in the third batching ground, and radiology won a median 5 times the qualifying payment amount in Q4 2024 against the emergency department’s 3. Radiology Partners and affiliates alone accounted for 28% of line items filed across 2023 and 2024. Authorization numbers that did not match the imaging performed appeared on 7% of advanced imaging claims we audited. See radiology billing.

Ambulance: ground versus air

Air ambulance is covered and has its own IDR queue, which handled 44,238 disputes in 2024. Ground ambulance is not covered at all, so a patient transported from the scene can still be balance billed and the agency has no federal route. State law is the only lever. Ground agencies should spend their effort where payment actually turns: Physician Certification Statements were missing or unsigned on 18% of non-emergency transports in our claim audit.

Behavioral health, primary care and everything the Act does not reach

The Act reaches emergency services, non-emergency services by out-of-network providers at in-network facilities, and air ambulance. It does not reach clinic, office, home or school-based care, so an out-of-network therapy or ABA claim has no federal route whatever the payer says, which is why those practices negotiate single case agreements instead.