Every public data breach

44 disclosed this week · 26,355 on record

Oak Valley Hospital District

Disclosed Sep 15, 2023284,629 affectedConfirmed

Official notice

Oak Valley Hospital District, the covered entity (CE), reported that it experienced a cyber-attack that compromised the protected health information (PHI) of 284,629 individuals. The PHI involved included names, addresses, dates of birth, Social Security numbers, health insurance information, diagnoses, lab results, medications, and claims information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In response to the breach and OCR’s investigation, the CE revised its policies and procedures, retrained its workforce members, and implemented additional technical safeguards.

What is known

People affected284,629 (as reported to HHS)
DisclosedSep 15, 2023
HappenedApr 21, 2023
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
attack2026-09-25
unknown to hackingby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 284629by backfillSource
summary2026-09-25
empty to Oak Valley Hospital District, the covered entity (CE), reported that it experienced a cyber-attack that compromised the protected health information (PHI) of 284,629 individuals. The PHI involved included names, addresses, dates of birth, Sby backfillSource
Added2026-09-25
First recordedby backfillSource

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

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