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44 disclosed this week · 26,355 on record

Seneca Nation Health System

Disclosed Feb 8, 202212,000 affectedConfirmed

Official notice

Seneca Nation Health System, the covered entity (CE), reported that it was the victim of a cybersecurity incident that affected the protected health information (PHI) of 12,000 individuals. The PHI involved included names, addresses, dates of birth, drivers’ license and Social Security numbers, claims and financial information, diagnoses/conditions, lab results, medication information, and other treatment information. The CE notified HHS, the affected individuals, and the media. In its mitigation efforts, the CE implemented additional administrative, technical, and security safeguards to better protect its sensitive data and retrained staff.

What is known

People affected12,000 (as reported to HHS)
DisclosedFeb 8, 2022
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.

Everything about Seneca Nation Health System