The dates below are a practical orientation based on current CMS materials—not a substitute for calculating the deadline for a specific dispute.

30 business days: start open negotiation

The initial clock generally begins when the provider receives the initial payment or notice of denial. Initiate open negotiation within that 30-business-day window; then track the separate 30-business-day negotiation period. Receipt can differ from the date printed on the remittance. Missing required payer information does not automatically extend the deadline.

30 business days: open negotiation

CMS describes a required 30-business-day open-negotiation period between the provider or facility and the plan or issuer. Federal IDR cannot be initiated until that period has ended.

4 business days: initiate federal IDR

CMS states that a party generally must initiate the federal IDR process within four business days after open negotiation ends. Department-issued extensions and special circumstances can affect a particular deadline, so the CMS Notices page belongs in the review workflow.

3 business days: report a post-initiation agreement

If the parties agree on an out-of-network rate after IDR is initiated but before a determination, CMS says the initiating party must provide the required agreement information within three business days.

30 calendar days: payment after a determination

CMS states that the parties must abide by the certified IDR entity’s decision and that payment must be made within 30 calendar days. An award record and a payment record should therefore be tracked as separate events.

2026 changes require implementation checks

Cooling-off rules depend on dispute type and negotiation start date. CMS's October 2 notice announces changes beginning November 1; check the batching guide and current CMS notice before calculating a post-cooling-off filing date. Portal-dependent provisions in the operations rule have separate applicability requirements.

A reliable deadline record includes

  • The source event and source document
  • Whether the unit is business days or calendar days
  • The calculated date and the person or system that calculated it
  • Any extension, portal notice, or exception relied upon
  • An owner, reminder, completion record, and escalation path