Batching claims in federal IDR: the rules

What does batching mean in federal IDR?

Batching means putting several out-of-network items or services into one federal IDR dispute so the certified IDR entity decides them together. The rule defines batched qualified IDR items and services as multiple items or services "considered jointly as part of one payment determination" (45 CFR 149.510(a)(2)(i)).

The point is cost and speed. Under 149.510(c)(4)(i), the rule describes batching as a way of "encouraging efficiencies (including minimizing costs)" in the process. A batch is decided in one payment determination and carries the certified IDR entity fee for batched disputes.

A bundled payment arrangement is a different thing and is covered below. For the steps around a dispute, see the federal IDR process page. For the QPA that goes with each item, see the QPA page.

Which batching rules apply to my dispute today?

The 50 line item cap and the new batching cooling-off rule apply when the open negotiation period starts on or after November 1, 2026. CMS said so in its August 3, 2026 notice, and 45 CFR 149.510(h) ties the batching paragraph (c)(4) to the date the Departments announce that the supporting functionality is available.

CMS announced that date. Its notice of August 3, 2026 said the functionality to support batched items "will be available on November 1, 2026, which is 90 calendar days after today's date". Its October 2, 2026 notice added that batched disputes with an open negotiation start date before November 1, 2026 stay under the 90-calendar-day cooling-off period.

Which claims can be batched together?

Items can be batched only if all four conditions in 45 CFR 149.510(c)(4)(i)(A) through (D) are met. They must come from the same provider, group or facility, go to the same plan or issuer, relate to a similar condition under one of the grouping paths, and fall in the same 30-business-day period.

The three grouping paths in paragraph (C)

Paragraph (C) lists three ways items can "relate to the treatment of a similar condition". Items need to satisfy only one of them.

1. One patient, one encounter. The items were furnished to a single patient during a single encounter. The rule defines that as an encounter on one or more consecutive days, with the items billed on the same claim form.
2. Same service code. The items were furnished to one or more patients and billed under the same service code, or a comparable code in a different coding system. The rule names CPT codes with modifiers, HCPCS codes with modifiers and DRG codes with modifiers, if applicable.
3. Same code range, for four specialties. For anesthesiology, radiology, pathology and laboratory items, the items were furnished to one or more patients and billed under service codes in the same Category I CPT code range, as specified in guidance published by the Secretary.

Can I batch claims across different payers or different providers?

No. The rule requires the same billing provider, group or facility (same NPI or TIN) and the same plan or issuer, so items that differ on either one go in separate disputes. Both limits are in 149.510(c)(4)(i)(A) and (B).

The payer test has detail that matters. For insured coverage, it is met if the same issuer must pay, even when the claims come from different group health plans or individual policies. For a self-insured group health plan, it is met if the same self-insured plan must pay, including when a third party administrator makes the payments.

It is not met when multiple self-insured plans must pay, "even if those group health plans make payments through the same third party administrator." So one administrator name on the remittance is not enough. You need to know which plan owes the payment.

Does batching work for facility and professional claims together?

The rule has no facility-plus-professional category, so each item must pass the same four tests in 149.510(c)(4)(i). Two of them involve the claim: the single-encounter path requires items "billed on the same claim form", and the service code path requires the same service code or a comparable code.

Facility claims go on the UB-04 and professional claims on the CMS-1500, which are different claim forms. Whatever the form, the items must also be billed with the same NPI or TIN. Test each item against paragraph (A) before you group them.

How many line items can be in one batch?

A batched dispute can hold up to 50 qualified IDR items and services. That cap is in 45 CFR 149.510(c)(4)(i), and CMS applies it to any batched dispute with an open negotiation start date on or after November 1, 2026.

CMS's October 2, 2026 notice puts it as a limit of "50 dispute line items" in the Notice of IDR Initiation web form.

How does the 30-business-day window work?

Every item in a batch must have been furnished within 30 business days of the first item in that batch. The window starts on the date the first item or service in the batched dispute was furnished (149.510(c)(4)(i)(D)).

Each item must also have been through a 30-business-day open negotiation period that ended within 4 business days of IDR initiation. Count business days with the NSA deadline calculator.

What is a bundled payment arrangement, and how is it different?

A bundled payment arrangement is one claim billed under one service code that represents multiple items or services for a single patient, such as a DRG code. It is decided as one payment determination and carries the single-determination fee, not the batched fee.

The definition is in 45 CFR 149.30. It covers a provider or facility that bills multiple items for one patient under a single service code, and a payer that makes its initial payment or denial under a single service code for multiple items for one patient. The rule's own example is a Diagnosis-Related Group code.

Under 149.510(c)(4)(ii), the certified IDR entity "must make a single payment determination" for the items in a bundled payment arrangement, and the dispute "is subject to the certified IDR entity fee for single determinations".

Do batched claims share one fee?

A batch shares one certified IDR entity fee, which is the entity's fee for batched determinations. Under 45 CFR 149.510(c)(4)(i), the items are decided in a single payment determination subject to that fee. Each party pays its own, up to the date offers are due.

The rule sets the certified IDR entity fee ranges for disputes initiated on or after January 22, 2024 (149.510(e)(2)(viii)). Entities may charge a fixed fee for single determinations in the range of $200 to $840 and a fixed fee for batched determinations in the range of $268 to $1,173, unless the Secretary approves a fee outside the range.

For batches, the rule also allows an additional fixed tiered fee within the range of $75 to $250 "for every additional 25 line items within a batched dispute, beginning with the 26th line item." The fee must be paid no later than the date a party submits its offer (149.510(d)(1)(i)), or that party's offer is not considered received.

The IDR administrative fee is separate. The rule sets it at $15 per party per dispute for disputes initiated on or after June 11, 2026 (149.510(d)(2)(ii)(B)) and calls it non-refundable. The rule text does not break the fee down by line item.

What happens after a batched decision?

In a batched dispute, the party with the most determinations in its favor is the prevailing party, and the party with the fewest is the non-prevailing party (149.510(c)(5)(ii)(A)). The entity keeps the non-prevailing party's entity fee and returns the prevailing party's fee within 30 business days of its decision.

If each side wins an equal number of determinations in a batch, the fee is split evenly. The entity then returns half of each party's fee within 30 business days of the payment determination (149.510(d)(1)(iii)).

A batched determination also starts a cooling-off period. The party that started the dispute may not submit a new notice against the same other party for the same items or services during the 30-business-day period after the determination (149.510(c)(5)(vii)(B)). For a single determination, that period is 90 calendar days.

If open negotiation for those items ends in that period, either party may start IDR in the 4-business-day period beginning the business day after the 30-business-day period ends (149.510(c)(5)(vii)(C)). Use the NSA deadline calculator to place that day.

What happens if I batch claims incorrectly?

The certified IDR entity decides which items are eligible, and only eligible items that also meet the batching requirements continue. Under 45 CFR 149.510(c)(2)(i), the entity "will not take any further action" on the other items in the batched dispute.

That eligibility review has its own applicability date. Paragraph (h)(4) ties (c)(2) to a Departments announcement of functionality, and the CMS notices page had announced none for it as of October 25, 2026.

CMS's tips page lists "Incorrectly batching or bundling multiple items or services" as a common mistake. It also says parties can upload "an email from a certified IDR entity requesting that a previously submitted dispute be resubmitted" with corrections to batching errors.

When should I file separate disputes instead of one batch?

File separately whenever any item fails one of the four conditions. Different payers, different NPIs or TINs, items outside the 30-business-day window, and items past the 50 line item cap cannot share a batch under 149.510(c)(4)(i).

For items that do qualify, the rule says an entity "may consider" up to 50 items jointly. Grouping changes three things in the rule text: the fee type, the cooling-off period (30 business days for a batch, 90 calendar days for a single determination), and how the prevailing party is decided (most determinations in a batch).

Emergency groups feel the limits because a group billing under one TIN still needs a separate dispute for each plan or issuer and each 30-business-day window. See billing for EDs and freestanding ERs. The out-of-network steps before filing are on the open negotiation page.

How we handle batching for out-of-network claims

We check every item against the four conditions before it enters a dispute: the NPI or TIN, the plan or issuer, the service code or encounter, the dates of service and the open negotiation dates.

Batching is one part of our out-of-network reimbursement work: eligibility assessment, open negotiation, dispute submissions, deadline management, documentation validation and outcome tracking under federal IDR and applicable state pathways, including Texas TDI. Required fees are paid on time so an unpaid fee does not cost you an offer.

The 2026 IDR operations rule page lists every change from the final rule. To have your disputes handled, see out-of-network billing and IDR or book a call.