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Leak SiteHHS OCRState AGConfirmed10 filings · 8 statesLifecycle stage 2 of 3: ConfirmedUnverified claimConfirmedEnforcedalphvhigh sensitivity
Merged incident · 10 filings

MCLAREN HEALTH CARE CORPORATION — July 2023 breach

Clustered 10 filings across 9 jurisdictions · filing window Sep 29, 2023 → Nov 9, 2023. View entity profile → Other incidents for this victim →

⚠ 2 cross-filing discrepancies →Merge100%

Determination

Confirmed

Members

10 filings

States

8

Affected · reported

2,192,515

First → last filing

Sep 29, 2023 → Nov 9, 2023

Merge confidence

100%

incident inc_b7018b13f1b9427d · merged by human · confidence 100%

Confirmed breach. Merged as one breach: 8 regulatory filings and 2 unverified claims. The filings describe unauthorized access. Intrusion Jul 28, 2023–Aug 23, 2023, discovered Aug 22, 2023 — the first regulatory filing landed 59 days later (flagged late). 2,192,515 individuals reported across the linked filings. Data reported: Government ID, PHI, Health (basic), and 3 more. Notifications rolled out on a 40-day schedule across 8 filings beginning Sep 29, 2023. Each member filing remains the legal record for its jurisdiction.

Litigation Timing

Notification delay
59days

Discovered → first regulatory filing

Discovery variance
49days

Range of discovered_at dates across filings

Leak precedence
20days before filing

Days between the first leak-site claim and the first regulatory filing. Positive = the claim came first (public exposure before disclosure). Negative = the claim trailed the filing, so there was no pre-disclosure leak. Counts regulatory filings only — press coverage is not a regulatory disclosure.

Filing span
40days

Time between earliest and latest filing

Not recorded for this incident

Materiality delta · SEC filing delay — no SEC 8-K in this cluster.

Regulatory clocksVermont✗ VT AG >45 bdayLeak gap⏱ Leak >30dHIPAA✓ HHS notifiedFull clock table in Litigation Timeline

Sensitive data

identity_government

Incident timeline

Jul 28, 2023breach begins
Aug 22, 2023discovered · members disagree
notification delay · 59 days
Oct 20, 2023first filing
Nov 9, 2023most recent filing

Dashed segments are unestablished, not zero — they fill in as filings merge into this incident.

Member cascade — every filing about this breach

  1. SEP 29Leak sitealphv postfirst filing · attacker claim · unverifiedday 0
  2. OCT 4Leak sitealphv postattacker claim · unverified+5d
  3. OCT 20HHS OCRHHS OCR noticestates nationwide total 2,103,881+20d
  4. NOV 9MT AGMT AG notice137 MT residents+40d
  5. NOV 9ME AGME AG noticestates nationwide total 2,192,515+40d
  6. NOV 9CA AGCA AG noticeno count stated+40d
  7. NOV 9MA AGMA AG notice352 MA residents+40d
  8. NOV 9NH AGNH AG notice115 NH residents+40d
  9. NOV 9ID AGID AG notice107 ID residents+40d
  10. NOV 9VT AGVT AG noticemost recent · no count stated+40d
  11. Watching for additional filings — new sources merge into this incident automatically.

Roll-up facts — reconciled across members

Breach window
Jul 28, 2023 – Aug 23, 2023
MT AG
Discovered
Aug 22, 2023MT AG + CA AG + NH AG +2Oct 10, 2023ME AGfilings disagree on discovery
Data types
Financial account · Health (basic) · Identity (basic) · Government ID · PHI · PII
HHS OCR + MT AG + CA AG +5
Attack vector
Unauthorized Access
HHS OCR

Each fact cites the member filing that establishes it; when filings conflict, every value shows with its source.

Count reconciliation

per-state reported counts

Nationwide (stated in a filing)

2,192,515

Sum of filed state slices

788· 0.0% of stated

100% of the stated total lives in states whose filings carry no count — the dashed share shrinks as filings land.

US2,192,515
MA352
MT137
NH115
ID107
ME77

State AGs report only their own residents; teal bars show each state's reported slice. The gray US row is the nationwide total reported in a linked filing.

Evidence ladder — rungs this incident occupies

Leak-site claim2 members

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

No press coverage linked yet.

State AG / regulator filing8 members

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

No SEC filing or victim statement yet.

Merge provenance

Method
human
Confidence
1.00 · above the 0.85 auto-merge floor
Reviewed
operator-reviewed Aug 22, 2026 · at least one link edge was human-adjudicated
Audit
Every link edge records its method, confidence and model + prompt versions (100% is the strongest edge).

Merges are reversible — a wrong link can be detached with its audit trail intact. How merging works.

Filing velocity

Spread

40 days

Cadence

~1 / 4.4d

vs. multi-state median

5.0× slower

About this clustering

DisclosureLens links filings into incidents through layered matchers: deterministic rules (same source document, multistate filings of one breach, tight-window same-victim pairs), a weighted-similarity scorer for cross-source candidates, and an operator review queue for everything uncertain. Each link records its own method and confidence — shown per filing in the timeline below. The system defaults to NOT merging when uncertain, because a false merge (collapsing two unrelated breaches) is more harmful than a false split (showing related filings separately); uncertain pairs route to human review instead of auto-merging. This page states only what the linked filings agree on; each filing's own account stays on its own record, linked from the timeline below.

The weekly clock on records like this one

The Disclosure Clock is a weekly briefing on what landed in the disclosure record, and the gap between the criminals' post and the regulator's filing — measured on the whole record, with the method shown.

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