One linked filing — more sources may join as they report · filed Mar 18, 2022. View entity profile → Other incidents for this victim →
incident inc_380a36190172469e · merge_method deterministic
Not recorded for this incident
Discovery variance · Leak precedence · Materiality delta · SEC filing delay · Filing span — no leak-site claim in this cluster; no SEC 8-K in this cluster; needs two dated filings.
PHI · Health (basic) · Identity (basic)
MI
all HHS OCR
Earliest sighting first · deep chronology in Litigation Timeline
Cancer and Hematology Centers of Western Michigan reported to HHS on 2022-03-18 a Hacking/IT Incident affecting 43,071 individuals. Breached information located on Network Server. The incident involved a ransomware attack encrypting PHI (names, addresses, DOB, SSN, financial info, diagnoses). The CE provided credit monitoring, implemented MFA, and additional technical safeguards.
Affected (this filing): 43,071
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. Filing summaries shown in the timeline are AI-generated extracts — verify each against its linked source.