No Surprises Act changes in 2026 and 2027: the $15 fee, 50-item batching, and new remittance codes

The three changes at a glance

In May 2026 the federal departments finalized the Federal Independent Dispute Resolution Operations rule, the largest update to the No Surprises Act arbitration process since it launched. Three provisions matter most for provider, RCM, and legal teams, and they phase in on three different dates.

Each change lowers the cost of pursuing a legitimate out-of-network claim, and together they change which claims are worth arbitrating at all.

The administrative fee drops from $115 to $15

Every party in a federal IDR dispute pays a non-refundable administrative fee to the government when the dispute is initiated. Through June 10, 2026 that fee is $115 per party. For disputes initiated on or after June 11, 2026 it falls to $15 per party.

The practical effect is on small-dollar claims. At $115, a disputed imaging read or a single emergency visit often could not justify filing on its own, because the fee plus the certified IDR entity fee could exceed the expected recovery. At $15, the floor drops sharply. Combined with batching, a group can now put a much larger share of its underpaid out-of-network book through the process economically.

The certified IDR entity fee still applies and is still paid by the non-prevailing party, which is why a benchmark-backed offer matters before filing. In the CMS public use files, providers won 85.8% of disputes through 2025Q4, and the median provider-won award was 4.7x the qualifying payment amount.

Batching expands from 25 to 50 line items

Batching lets a provider bundle multiple qualified items or services into a single dispute with a single set of fees, when the items share the same payer and fall in the same service code category. The prior limit was 25 line items per batched dispute. For open negotiation periods beginning on or after November 1, 2026, the limit doubles to 50.

Note the trigger: the date the open negotiation period begins, not the date IDR is initiated. A negotiation window opened in late October 2026 still lives under the 25-item limit even if the IDR filing lands in December. Teams planning high-volume filings around the transition should time notice dates deliberately.

For high-frequency, low-dollar specialties like emergency medicine, radiology, pathology, and anesthesia, the math is direct: half the disputes, half the fees, for the same claim volume.

Standardized CARC and RARC codes arrive January 1, 2027

Today, one of the hardest operational problems in NSA work is simply recognizing which remittances are NSA-eligible. Plans communicate the qualifying payment amount and surprise-billing protections inconsistently, and eligibility signals are often buried in free text or missing entirely.

Starting January 1, 2027, plans and issuers must use standardized claim adjustment reason codes (CARCs) and remittance advice remark codes (RARCs) when they send the initial payment or notice of denial for NSA-covered items and services. That gives billing teams a machine-readable flag for which claims sit in scope, when the open negotiation clock started, and what the plan asserts the QPA to be.

Teams that wire those codes into their billing systems will be able to trigger open negotiation deadlines automatically instead of discovering eligible claims after the window has closed.

What the changes mean for filing economics

The pre-2026 process rationed arbitration by friction: fees, admin overhead, and small batch sizes meant only the largest or most obviously winnable claims got filed. The 2026 and 2027 changes remove much of that friction, and the public data explains why volume keeps growing anyway. Providers won 85.8% of the 3.39 million federal IDR disputes resolved through 2025Q4, with a median provider-won award of 4.7x QPA.

Payers can read the same data. The likely payer response to cheaper filing is more aggressive eligibility challenges and more pressure in open negotiation, which makes clean claim files and deadline discipline more valuable, not less.

Before scaling filings, benchmark your specific mix: the federal IDR benchmark hub shows win rates and award multiples by service code, state, payer, and specialty, so you can see how disputes like yours actually resolve.

How to prepare before each date

Before June 11, 2026: hold non-urgent filings where deadlines allow, since a dispute initiated on June 11 costs $100 less per party than one initiated June 10. Never hold a claim past its 4-business-day IDR window to chase the fee change.

Before November 1, 2026: map your underpaid out-of-network book into same-payer, same-service-category batches of up to 50, and time open negotiation notices so the windows begin on or after November 1 where the economics justify waiting.

Before January 1, 2027: ask your clearinghouse or billing system vendor how the new CARC and RARC codes will surface in your workflow, and build the rule that turns those codes into an open negotiation task with a deadline.

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