Answers / The timeline
The open negotiation timeline, date by date
The timeline runs: payer pays or denies the claim, the provider has 30 business days to send the open negotiation notice, the negotiation window runs 30 business days from the send, and if it closes without agreement the provider has 4 business days to initiate federal IDR. Everything is business days, excluding weekends and federal holidays.
The chain in one table
| Event | Window | Counted from |
|---|---|---|
| Send the open negotiation notice | 30 business days | Payer's initial payment or notice of denial |
| Open negotiation period | 30 business days | The day the notice is sent |
| Initiate federal IDR | 4 business days | The negotiation window closing |
After initiation, the arbitration deadlines take over: 3 business days to agree on a certified IDR entity, offers within 10 business days of selection, a decision within 30 business days, and payment within 30 calendar days of the decision. The median published dispute took 37 days from selection to decision.
Business days change the feel of every window
Thirty business days is roughly six calendar weeks, which sounds roomy until the window is shared with claim review backlogs and staff who do not know the clock exists. The 4 business day filing window is less than one calendar week and is the shortest deadline in the entire No Surprises Act process. Holidays matter too: a December remittance runs its windows through two federal holidays, which moves real dates by most of a week against a naive count.
The trigger is the remittance, not the discovery
The first 30 business day window starts when the payer pays or denies, not when anyone notices the underpayment. That single fact is why open negotiation discipline is really remittance-review discipline: a protected claim identified in week seven is already dead, however strong its merits. One nuance cuts the other way: the clock is supposed to run from a compliant payment or denial, with the required No Surprises Act disclosures attached, so a remittance that never carried them may not have started the clock. Treat that as an argument to make, never a plan to rely on.
Settlement can land anywhere on the line
The parties can agree at any point in the window, and a deal ends the dispute with no fees and no arbitrator. What the timeline really determines is leverage: a provider who demonstrably will file, on time, with a credible offer, negotiates against the published record, where providers won 85.8 percent of decided disputes at around 4.7 times the qualifying payment amount. A provider who visibly cannot keep the dates negotiates against nothing.
Stop counting business days by hand
Lido IDR computes every date from the remittance and files before the windows close, for a flat fee per arbitration. Talk to an IDR specialist.