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44 disclosed this week · 26,355 on record

Seneca Nation Health System

Disclosed Sep 6, 202416,879 affectedConfirmed

Official notice

The covered entity (CE), Seneca Nation Health System, reported that it was the victim of a cybersecurity incident that affected the protected health information (PHI) of 16,879 individuals. The PHI involved included names, dates of birth, Social Security numbers, addresses, drivers’ license numbers, financial and claims information, diagnoses/conditions, lab results, medications, and treatment information. The CE notified HHS, the affected individuals, and the media. In response to the breach, the CE provided complimentary credit monitoring services to the affected individuals and implemented additional administrative, technical, and security safeguards to better protect its PHI.

What is known

People affected16,879 (as reported to HHS)
DisclosedSep 6, 2024
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at Seneca Nation Health System

History of this record
Added2026-09-25
First recordedby backfillSource

First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.

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