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Monongalia Health System

Disclosed Dec 21, 20214 years ago492,861 affectedConfirmed

Official notice

The covered entity (CE), Monongalia Health System, reported that it was the victim of a ransomware attack affecting the protected health information (PHI) of 492,861 individuals. The PHI involved included names, addresses, Social Security numbers, health insurance and claims information, dates of birth, and other treatment information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In response to the breach, the CE implemented additional administrative and technical safeguards and provided complimentary credit monitoring services to affected individuals.

What is known

People affected492,861 (as reported to HHS)
DisclosedDec 21, 2021
HappenedDec 8, 2021
AttackHacking
Data exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

WhereFiledPeople
HHS archivetotalDec 21, 2021398,164
California AGresidents of CAFeb 28, 2022
Indiana AGresidents of INFeb 28, 20222
HHS archivetotalFeb 28, 2022492,861

Other breaches at Monongalia Health System

BreachAffected
Disclosed May 3, 2025May 3, 20251 year agoInsider4,895
History of this record
  • 2026-09-25 · disclosed: 2022-02-28 to 2021-12-21 · backfill source
  • 2026-09-25 · attack: unknown to hacking · backfill source
  • 2026-09-25 · data_types: [] to ["names","health"] · backfill source
  • 2026-09-25 · records_basis: organization to hhs · backfill source
  • 2026-09-25 · records: 472420 to 492861 · backfill source
  • 2026-09-25 · summary: empty to The covered entity (CE), Monongalia Health System, reported that it was the victim of a ransomware attack affecting the protected health information (PHI) of 492,861 individuals. The PHI involved included names, addresses, Social Security n · backfill source
  • 2026-09-25 · records_basis: empty to organization · backfill source
  • 2026-09-25 · records: empty to 472420 · backfill source
  • 2026-09-25 · added · backfill source

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

Everything about Monongalia Health System

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