No Surprises Act Update 2026: What Out-of-Network and Emergency Providers Need to Know About the New Federal IDR Final Rule

The federal government has issued a significant update to the No Surprises Act (“NSA”) and the Federal Independent Dispute Resolution (“IDR”) process, signaling another major shift in how out-of-network reimbursement disputes will be handled between providers and health plans. The newly released Final Rule issued by the Departments of Health and Human Services, Labor, Treasury, and the Office of Personnel Management focuses heavily on improving the administration and functionality of the Federal IDR process.

For healthcare providers, particularly hospitals, emergency departments, air ambulance providers, ambulatory surgical centers, and physician groups furnishing out-of-network emergency or ancillary services, these changes are important. The Final Rule attempts to address widespread complaints that the current IDR system has become overly burdensome, delayed, and saturated with disputes.

A Brief Refresher: What the No Surprises Act Does

The No Surprises Act was enacted to protect patients from unexpected medical bills arising from certain out-of-network services. The law generally prohibits balance billing for:

• Emergency services provided by out-of-network providers or facilities;

• Certain non-emergency services rendered by out-of-network providers at in-network facilities; and

• Certain air ambulance services.

In those circumstances, patients are generally responsible only for their applicable in-network cost-sharing amounts, while reimbursement disputes between the provider and payor are resolved separately through negotiation or the Federal IDR process.

Since implementation began in 2022, however, the IDR system has faced enormous operational strain. According to CMS, more than 5.1 million disputes had already been submitted into the Federal IDR process as of January 2026.

The newly issued Final Rule is intended to address many of these operational problems.

Major Changes Under the 2026 Final Rule

1. Increased Transparency in Initial Payments and Denials

One of the most significant updates is the requirement that health plans provide more detailed information when issuing initial payments or notices of denial.

The Final Rule specifically requires plans and issuers to communicate important claims-processing information using standardized Claim Adjustment Reason Codes (“CARCs”) and Remittance Advice Remark Codes (“RARCs”) when dealing with out-of-network providers.

Practically speaking, this means providers should begin receiving clearer explanations regarding:

• Whether a claim is subject to the No Surprises Act;

• Whether the claim qualifies for Federal IDR;

• Whether state law applies instead of Federal IDR;

• Whether the payment is considered an initial payment under the NSA; and

• How the patient’s cost-sharing was calculated.

Historically, one of the largest frustrations for providers has been the lack of transparency surrounding payor reimbursement methodologies and eligibility for IDR. Many providers have been forced to manually review claims and remittances to determine whether disputes were even eligible for the Federal process.

The government acknowledged this problem directly in the Final Rule, noting that poor communication between plans and providers has contributed to inefficiencies and unnecessary disputes.

For providers, this is likely to become a meaningful compliance and operational development. Revenue cycle teams should expect changes to remittance formats and should ensure that billing staff, reimbursement analysts, and outside vendors understand the new coding structure once CMS issues implementation guidance.

2. More Scrutiny Over IDR Eligibility

The Final Rule also attempts to reduce the enormous number of ineligible disputes flooding the IDR system.

CMS reported that hundreds of thousands of disputes submitted into the Federal IDR process were ultimately found ineligible. Many disputes involved claims that were:

• Governed by state law instead of Federal IDR;

• Improperly batched together;

• Outside the NSA altogether; or

• Submitted without satisfying open negotiation requirements.

In response, the government is strengthening eligibility review procedures and increasing disclosure requirements before disputes proceed.

Providers should understand that procedural compliance is becoming increasingly important. Failure to properly complete open negotiation, batch disputes correctly, or timely initiate IDR may result in dismissals before the merits are ever reviewed.

3. New Rules on Open Negotiation

The open negotiation period, the mandatory 30-business-day negotiation window before IDR can be initiated, is receiving renewed attention under the Final Rule.

Federal regulators specifically cited provider and payor complaints that many parties were not engaging in meaningful negotiations before proceeding to arbitration.

The new regulations establish:

• Enhanced notice requirements during open negotiation;

• Clarifications regarding when the negotiation period officially begins;

• Additional response obligations; and

• New procedural requirements tied to communications between the parties.

For providers, documentation is critical. Revenue cycle teams and counsel should maintain detailed records of:

• Open negotiation notices;

• Dates of transmission;

• Supporting payment information;

• Email correspondence; and

• Proof of compliance with NSA timing requirements.

As enforcement and eligibility scrutiny increase, procedural documentation may become just as important as the underlying reimbursement dispute itself.

4. Clarification Regarding Bundled and Batched Claims

The Final Rule also addresses confusion regarding “bundled payment arrangements” and batched disputes.

CMS finalized a definition of “bundled payment arrangement” that includes situations where multiple services are billed under a single code, such as DRGs or certain CPT/HCPCS codes.

This matters because:

• Bundled claims may proceed as a single dispute under certain circumstances;

• Improper batching remains one of the leading causes of IDR dismissals; and

• Providers must ensure claims satisfy the batching rules before filing.

Facilities and physician groups utilizing sophisticated reimbursement strategies or large-scale IDR submissions should carefully review their batching methodologies moving forward.

5. Continued Litigation Over the Qualifying Payment Amount (“QPA”)

Importantly, the Final Rule does not fully resolve ongoing litigation regarding the “Qualifying Payment Amount” or “QPA” — the insurer-calculated median in-network rate that heavily influences IDR outcomes.

The Final Rule acknowledges the ongoing Texas Medical Association (“TMA”) litigation challenging portions of the NSA regulations and QPA methodology.

For providers, the QPA remains a critical issue because many insurers continue to anchor reimbursement offers around allegedly depressed QPA calculations. CMS itself acknowledged that providers have consistently argued that artificially low QPAs are driving increased use of the IDR process.

Accordingly, providers should continue:

• Preserving evidence regarding market rates;

• Documenting commercial reimbursement benchmarks;

• Challenging unsupported QPA calculations; and

• Maintaining strong arbitration narratives focused on acuity, complexity, market conditions, and provider expertise.

What This Means for Out-of-Network and Emergency Providers

The 2026 Final Rule represents less of a substantive overhaul of reimbursement rights and more of an operational restructuring of the Federal IDR process.

From a practical standpoint, providers should expect:

• Increased procedural oversight;

• Greater standardization in remittance communications;

• Tighter scrutiny over dispute eligibility;

• More robust documentation expectations; and

• Continued heavy reliance on arbitration for reimbursement disputes.

Emergency providers and facilities remain protected from balance billing prohibitions under the NSA, but reimbursement disputes with payors are becoming increasingly technical and compliance-driven.

Providers that invest in sophisticated revenue cycle operations, legal oversight, and organized IDR workflows will likely be in the strongest position moving forward.

Final Thoughts

Although the No Surprises Act was originally intended as a patient-protection statute, its long-term impact has fundamentally reshaped out-of-network reimbursement disputes across the healthcare industry.

The newly issued Final Rule demonstrates that Federal regulators recognize the operational failures and administrative burdens currently impacting the IDR process. Whether these changes ultimately streamline dispute resolution remains to be seen. However, one thing is certain: compliance, documentation, and strategic reimbursement advocacy are becoming more important than ever for healthcare providers operating in the out-of-network landscape.

Healthcare providers, physician groups, hospitals, and emergency facilities should work closely with experienced healthcare reimbursement counsel and revenue cycle professionals to ensure they remain compliant while aggressively protecting their reimbursement rights under the evolving NSA framework.

For the full text of the NSA Final Rule entered May 28, 2026, see: https://www.cms.gov/files/document/federal-independent-dispute-resolution-operations-cms-9897-f.pdf