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The HIPAA breach clock: what starts it and what it requires

The sixty-day deadline runs from discovery, not from confirmation. Knowing when discovery happens is most of the battle.

The Ledger · No. 005 · Aug 2026 · Reviewed Sep 30, 2026 · 8 min read

When the clock starts

Under the Breach Notification Rule, a breach is treated as discovered on the first day it is known to the covered entity, or would have been known by exercising reasonable diligence. Knowledge by any workforce member other than the person who committed the breach counts. That means the clock can start when a front-line employee notices a misdirected fax, well before compliance hears about it.

A working timeline

The rule sets the outer limit. The milestones below are a suggested internal schedule that leaves time for notice drafting and review; they are not regulatory deadlines.

  1. 1
    Day 0: discovery
    Known, or would have been known with reasonable diligence
  2. 2
    First 24 hours: triage
    Contain and isolate
    Log the incident and the discovery date
  3. 3
    Days 1 to 15: risk assessment
    Four-factor risk assessment
    Decision documented either way
  4. 4
    Days 16 to 45: if reportable
    Draft notices
    Complete forensics and mitigation
  5. 5
    Within 60 days of discovery
    Affected individuals
    HHS at the same time if 500 or more are affected
    Media if more than 500 residents of a state
    Under 500: annual report to HHS within 60 days of year end

Documenting the four-factor assessment

Record each factor and the evidence behind it. If the conclusion is a low probability of compromise, this record is what supports not notifying.

FactorWhat to evaluateEvidence to keep
1. Nature and extent of the PHITypes of identifiers, clinical sensitivity, likelihood of re-identification.Data inventory of what was exposed, record counts.
2. The unauthorized recipientWho received or used it, and whether they have their own duty of confidentiality.Recipient details, any signed attestation or professional obligation.
3. Whether it was acquired or viewedWhether PHI was actually opened, or only exposed.Access and session logs, forensic findings.
4. Extent of mitigationHow quickly and completely the risk was contained.Destruction attestations, remote-wipe confirmations.

Presumption and the risk assessment

An impermissible use or disclosure of PHI is presumed to be a breach unless the organization demonstrates, through a documented risk assessment, a low probability that the PHI has been compromised. The assessment considers at least four factors: the nature and extent of the PHI involved; the unauthorized person who used it or received it; whether the PHI was actually acquired or viewed; and the extent to which the risk has been mitigated.

The assessment and its conclusion should be documented whether or not notification follows. It is the record that justifies a decision not to notify.

Who must be notified, and by when

Affected individuals: without unreasonable delay and no later than sixty calendar days after discovery. The Secretary of HHS: for breaches affecting 500 or more individuals, contemporaneously with individual notice; for fewer than 500, in an annual log submitted within sixty days after the end of the calendar year. Prominent media: when more than 500 residents of a state or jurisdiction are affected. A business associate must notify the covered entity without unreasonable delay and within sixty days of its own discovery; many BAAs shorten that period.

State breach laws may impose shorter deadlines or additional recipients. Track both.

Operational habits that help

Make reporting a suspected incident easy and non-punitive, so discovery reaches compliance on day one rather than day twenty. Record the discovery date separately from the report date. Start the risk assessment the same day. Keep the notification log, templates, and mailing records together with the incident so the whole response can be produced as one record.

Closing the loop

Is it working?
Suspected incidents reach compliance on the day they are discovered, and risk assessments start the same day.
Can you show it?
Keep the discovery date, the four-factor assessment, the notification decision, and the notification log together in one record.

This article is general information, not legal advice. Regulatory requirements vary by jurisdiction and care setting; confirm specifics against the current regulation and with qualified counsel.

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