NSA vs. IDR: the law, and the arbitration it created.
Short answer: the No Surprises Act (NSA) is the federal law; Independent Dispute Resolution (IDR) is the arbitration process the law uses to settle insurer–provider payment fights. Every IDR dispute is an NSA dispute; not every NSA rule is about IDR. The rest of this page unpacks the difference.
Side by side
| No Surprises Act | Independent Dispute Resolution | |
|---|---|---|
| What it is | A federal law (effective January 2022) that protects patients from surprise out-of-network bills for emergency care, air ambulances, and out-of-network clinicians at in-network facilities. | The federal arbitration process the law created for insurer–provider payment fights that open negotiation doesn't settle. |
| Who it affects | Patients (protection from balance billing), providers (must accept the arbitration outcome), and insurers (must pay it). | Providers and insurers only — the patient's cost share never rises because of an IDR award. |
| The output | A whole set of rules — patient protections, disclosure requirements, and the payment-dispute pipeline. | A single binding dollar award per dispute, paid within 30 business days. |
| The mechanism | Legislative — Congressional statute + implementing regulations from CMS and Treasury. | Baseball-style arbitration — each side submits one dollar figure, an IDR entity picks one, no splitting the difference. |
| What is public | The law and rules themselves — publicly published statutes and regulations. | The arbitration record — who filed, who won, what was awarded — which becomes part of the public dataset NSA Tracker reads. |
Terminology that trips people up
QPA — Qualifying Payment Amount
The insurer's median contracted rate for the service in the local market. Every payer sets it differently. The arbitrator anchors the decision to it.
Open negotiation
A 30-business-day window BEFORE IDR is initiated. Both sides try to reach a number on their own; most disputes that settle, settle here.
Baseball-style arbitration
Each side submits one number, the arbitrator picks one — no splitting the difference. Forces both sides toward a defensible figure.
Batched disputes
Multiple line items resolved as a single arbitration — common for related services or codes filed together against the same payer.
Where NSA Tracker fits
NSA Tracker reads the public IDR arbitration record — the outcomes of the disputes the No Surprises Act sends to arbitration. See out-of-network revenue for what codes actually pay, No Surprises Act market share for who is capturing the disputes, and how the process works for the step-by-step walkthrough.
Common questions
Is IDR part of the No Surprises Act?
Yes. Independent Dispute Resolution is the federal arbitration process the No Surprises Act created. When an insurer and an out-of-network provider can't agree on payment during the 30-day open-negotiation window, either side initiates IDR through the federal portal and a certified IDR entity picks one of the two submitted offers.
What is the difference between the No Surprises Act and IDR?
The No Surprises Act is the federal law that protects patients from surprise out-of-network bills. IDR — Independent Dispute Resolution — is the specific baseball-style arbitration process the law uses to resolve the resulting payment fights between insurers and providers. The Act is the framework; IDR is the mechanism inside it.
Does IDR affect what patients pay?
No. The No Surprises Act guarantees the patient's cost share is what it would have been in-network. The IDR award moves money only between insurer and provider — a higher or lower arbitration outcome never changes what the patient owes.
Who decides the IDR outcome?
A certified IDR entity (IDRE) — a neutral third-party arbitrator certified by CMS. There are only a few dozen of them handling the entire country. The parties either agree on an IDRE or the government assigns one, and the arbitrator picks one of the two submitted dollar figures using the QPA as the anchor.
How long does an NSA / IDR arbitration take?
The full pipeline runs roughly two to four months from claim identification to a paid award: 30 business days of open negotiation, then IDR initiation and IDRE selection, then offer submission and a decision, then a 30-business-day payment window on the award. The specifics vary by IDR entity, batch size, and payer.