Federal IDR · Guide
IDR deadlines and the four business day windowA guide for surgical billing teams.
Two clocks govern federal IDR. First, a 30 business day open negotiation period must run before you can file. Second, once that period closes, you have only four business days to initiate IDR. Miss the second window and the claim cannot be disputed. Tracking both clocks across a full claim volume is the single hardest part of filing in house.
Two deadlines govern everything.
The federal IDR process lives and dies on two deadlines. Understand them and the rest is paperwork.
The open negotiation period.
The first is open negotiation. Before any claim reaches arbitration, a 30 business day open negotiation period must run. This is a required attempt to settle directly with the plan. Most claims do not settle here, but the period cannot be skipped.
The four business day window.
The second is the window that catches everyone. Once open negotiation closes, you have four business days to initiate IDR. Four. Not calendar days, business days, but still a narrow window that closes fast when a billing team is managing dozens of claims at once.
Why in house filing breaks down.
This is why in house filing breaks down at scale. A spreadsheet cannot reliably flag four business day windows across a rolling volume of claims, each with its own open negotiation start date. Something always slips. Every slipped claim is money the practice earned and then lost on a calendar technicality.
Sydra tracks both clocks for every claim and surfaces the windows before they close. The deadline stops being the thing that loses you money.
Common questions.
When does the open negotiation clock start?
On the date you or the plan sends the open negotiation notice for the claim. Document that date carefully, because the four business day window counts from 30 business days later.
What happens if I miss the four business day window?
The claim is no longer eligible for IDR. The underpayment becomes permanent. This is the most expensive mistake in the process and the easiest to make at volume.
This page is general information about the No Surprises Act dispute process, not legal advice. Eligibility depends on the specific plan, claim, and current federal and state rules. Confirm details for your claim before filing.
Sourced references
- 1. CMS Federal IDR Q1/Q2 2025 Public Use FileReleased January 21, 2026cms.gov/nosurprises/policies-and-resources/reports
- 2. Georgetown University CHIR · Health Affairs webinarMarch 2026 — 3.4 million disputes through June 2025; 88% win rate; median award ~4.5x in network rate
- 3. Zelis — NSA IDR Eligibility ChallengesMarch 2026 — 44% of 2024 IDR cases challenged as ineligible by non initiating party
- 4. ACEP analysis of CMS data~10% of eligible claims estimated to reach IDR arbitration
- 5. Brookings Institution NSA Arbitration DatabookApril 2026brookings.edu/articles/no-surprises-act-arbitration-databook
- 6. ACR — Providers Prevail in Vast Majority of IDR ClaimsJanuary 2026 — 88% of disputes found in provider's favor; 87% of awards exceeded QPA
- 7. No Surprises Act: Public Law 116-260, Division BB, Title I
- 8. Federal IDR regulations: 45 CFR Part 149ecfr.gov/current/title-45/subtitle-A/subchapter-F/part-149
- 9. CMS No Surprises Act overviewcms.gov/nosurprises
- 10. HHS HIPAA for professionalshhs.gov/hipaa/for-professionals
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