Why do providers win IDR arbitration so often?

Structure. The arbitrator must pick one of the two offers in full. Payers tend to anchor their offer at or near the qualifying payment amount, their own median contracted rate, while the No Surprises Act directs arbitrators to also weigh provider training and experience, patient acuity and case complexity, market share, scope of services, and prior contracting history. A provider offer supported by evidence on those factors beats a bare QPA offer most of the time.

Does the 85.8 percent win rate mean my claim will win?

No. The rate describes decided disputes that were eligible, filed on time, and argued with evidence. Claims die before arbitration by missing the 30 business day negotiation window or the 4 business day filing window, and disputes lose when the claim was ineligible or the packet was thin. The published record is best read as what disciplined filing achieves, not what any claim gets by default.

Answers / Who wins

Who wins IDR arbitration? What 3.39 million decisions show

Q: Who wins IDR arbitration?

Providers. Across the 3.39 million federal IDR disputes CMS published from 2023 through 2025, providers won 85.8 percent of decided disputes, and the typical winning award ran about 4.7 times the qualifying payment amount the payer anchored on. The rate holds across major specialties, most of which sit between 80 and 90 percent.

Providers, 85.8 percent of the time. Every federal IDR arbitration decision is published by CMS, and the record from 2023 through 2025 covers 3.39 million disputes. Providers won 85.8 percent of decided disputes, the typical winning award ran about 4.7 times the qualifying payment amount the payer started from, and the median decision took 37 days. The No Surprises Act built a process where a prepared provider offer usually beats a payer offer sitting at the payer's own median rate.

The number is structural, not luck

Federal IDR is baseball-style arbitration: each side submits one offer, and the arbitrator must pick one in full. That forces both sides to be reasonable, but it punishes the side that anchors mechanically. Payers overwhelmingly anchor at or near the qualifying payment amount (QPA), which is the payer's own median contracted rate for the service in that market. It is the number the statute makes them disclose, and it is the number their systems produce.

The statute then tells arbitrators what else to weigh when a party raises it: the provider's training, experience, and outcomes, the acuity of the patient and complexity of the case, the market share of each side, the scope of services the practice or facility offers, and prior contract history between the parties. A provider offer that arrives with real evidence on those factors is not competing against a thoughtful counter-valuation. It is competing against a database median. That is the contest providers win 85.8 percent of the time.

How it varies

The win rate holds remarkably well across the record:

By specialty. Most major categories sit between 80 and 90 percent. Surgical specialties alone account for more than 136,000 published disputes at win rates of 85 to 90 percent; that breakout lives at idrforsurgeons.com. Emergency medicine, radiology, and anesthesia, the highest-volume categories, all clear 80 percent.
By payer. Rates differ payer to payer, and some payers contest far harder than others. The full record is searchable by payer, state, specialty, and IDR entity at idrexplorer.com.
By filer discipline. The quiet variable. Disputes lost by default, filed on ineligible claims, or submitted with thin packets drag down a filer's rate. The spread between careful filers and careless ones is visible in the published data.

What the 14 percent that lose look like

Losses cluster in predictable places: claims that were not eligible in the first place, offers set so high that the payer's QPA offer looked reasonable by comparison, packets that asserted the statutory factors without evidencing them, and defaults where a deadline inside the arbitration was missed. The common thread is process, not merits. The deadlines that decide many of these outcomes are in the timeline guide, and what a loss costs is in the fees guide.

Read the record the right way: 85.8 percent is not a promise attached to any claim. It is what eligible claims, filed on time, argued with evidence, achieve at scale. The whole job is keeping your claims inside that description.

Want to see claims like yours in the record?

Bring your payer mix and specialty to a 30 minute call. We will pull what similar providers won at IDR arbitration, payer by payer, and walk through what a flat fee arrangement looks like. Talk to an IDR specialist.