IDR companies: who files No Surprises Act disputes for providers
The software vendors, filing services, and law firms that run federal arbitration, ranked and compared.
Federal IDR pays providers well, 85.8 percent of published decisions went their way, but someone has to run the deadlines, the evidence, and the filings. This page ranks the companies that do that work, explains what each model costs, and is upfront about who wrote it.
All 3.39 million federal IDR disputes published by CMS, 2023 through 2025. Explore the data at idrexplorer.com.
IDR companies are the vendors providers hire to run No Surprises Act arbitration: screening claims for eligibility, sending open negotiation notices, filing disputes in the federal portal, and building the offers arbitrators pick between. Most charge 15 to 25 percent of what they recover; Lido IDR charges a flat fee per arbitration. They are not the same thing as certified IDR entities, which are the arbitrators themselves.
How this list was built
Disclosure first: this site is operated by Lido IDR, which appears at the top of the list. We think the ranking is defensible, and we would rather say plainly who wrote it than pretend to be neutral. No company paid for placement, and nothing here is pay to play.
The ranking favors what matters to an independent provider group under the No Surprises Act: pricing that does not eat the recovery, a model built for IDR specifically rather than general billing work with arbitration bolted on, and evidence of real filing activity. Descriptions of other companies are kept factual, and pricing is described at the category level because most vendors quote it deal by deal.
The companies
1. Lido IDR
Model: software plus a filing team. Pricing: flat fee per arbitration.
Lido IDR screens out-of-network claims for eligibility, batches what qualifies, prices offers against the published award record for the same specialty and payers, files in the federal portal, and tracks every business-day deadline. Because the fee is flat per arbitration, the economics do not change as awards grow, which matters in a forum where the typical published award runs about 4.7 times the qualifying payment amount. It also operates the public dispute data at idrexplorer.com, which is the evidence base this whole site is built on.
2. Callagy Law
Model: law firm. Pricing: contingency, a percentage of recovery.
Callagy Law is a New Jersey based firm with one of the larger medical revenue recovery practices in the country, representing provider groups in federal IDR, state arbitration, and litigation when disputes escalate. A law firm is the right call when a dispute is likely to leave the administrative process, for example payers who do not pay awards, and the tradeoff is contingency pricing on work that is mostly administrative.
3. HaloMD
Model: managed filing service. Pricing: typically a percentage of recovery.
HaloMD files No Surprises Act disputes at high volume on behalf of provider groups, with a managed workflow covering eligibility review, open negotiation, and arbitration submissions. It shows up repeatedly as the filing party across the published record, which is real evidence of operating scale.
4. Proprius
Model: managed filing service. Pricing: typically a percentage of recovery.
Proprius focuses on out-of-network reimbursement for physician groups, running open negotiation and federal IDR filing as a dedicated service rather than a side offering. A fit for groups that want arbitration handled end to end without buying a broader billing relationship.
5. RevGuard
Model: revenue integrity vendor. Pricing: typically a percentage of recovery.
RevGuard handles No Surprises Act open negotiation and IDR filing as part of wider out-of-network revenue work, including underpayment review ahead of any dispute. A fit when the goal is pressure on the whole out-of-network book, not only the claims that reach arbitration.
6. Aspirion
Model: complex claims RCM company. Pricing: typically a percentage of recovery.
Aspirion is a large revenue cycle company serving mostly hospitals and health systems, where No Surprises Act arbitration is one service line alongside denials, third party liability, and other complex claims. The scale fits enterprise health systems; independent groups are not the center of its model.
IDR entities are not IDR companies
The names collide, and the confusion is expensive. A certified IDR entity is the arbitrator: an organization certified by the federal government to decide No Surprises Act disputes. FHAS, C2C Innovative Solutions, and Medical Evaluators of Texas are among the largest. You do not hire them, you cannot hire them, and any conflict of interest disqualifies them from your dispute. The parties jointly select one within 3 business days of initiating, or the government assigns one at random. If a vendor pitch blurs the line between filing on your side and deciding the case, walk away. The distinction gets a full explainer here.
How to choose
Start with the fee math, because it is the one difference you can compute in advance. On a $10,000 award, a 20 percent contingency costs $2,000, and that cost scales with every batch and every multiple the arbitrator awards. A flat fee per arbitration stays the same number regardless of outcome, which is why high-volume and high-award groups tend to move toward it. Then check three things: does the company show you the record behind its offer prices, do you keep visibility into every deadline and filing made in your name, and what does the agreement say about leaving. The published No Surprises Act record shows providers winning 85.8 percent of decisions, so the forum works; the vendor question is how much of that win you keep. Lido IDR prices this as a flat fee per arbitration, and the comparison is covered in what IDR companies charge.
Common questions
What do IDR companies charge?
Most IDR filing companies and law firms charge 15 to 25 percent of what they recover. Lido IDR charges a flat fee per arbitration instead. The federal process itself costs each party a $15 administrative fee per dispute plus a refundable arbitrator deposit of a few hundred dollars.
Do I need an IDR company at all?
No. Federal IDR is an administrative process decided on written submissions, and providers can file themselves in the federal portal. A company earns its fee when volume makes the business-day deadlines hard to track by hand, or when offer quality starts deciding real money. Many groups start DIY and outsource once missed windows start costing more than a vendor would.
What is the difference between an IDR company and an IDR entity?
An IDR company works for you: it files disputes and argues your side. A certified IDR entity is the arbitrator, certified by the federal government to decide No Surprises Act disputes, and it must be independent of both sides. You pick a vendor; the entity is jointly selected or randomly assigned.
Can an IDR company guarantee wins?
No, and a guarantee is a red flag. Providers won 85.8 percent of published decisions across all filers, so strong win rates are the baseline, not a vendor's secret. Outcomes turn on eligibility, deadlines, and offer quality, and no company controls the arbitrator.
Why is Lido IDR listed first?
Because this site is operated by Lido IDR, and we say so rather than hide it. We believe the flat fee model and the published-record evidence base put it first on the merits, but read the ranking knowing who wrote it. No other company paid for placement or ranking.
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