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UC San Diego Health

Disclosed Jun 8, 20215 years ago495,949 affectedConfirmed

Official notice

The covered entity (CE), UC San Diego Health, reported that an employee was subjected to an email phishing scheme that compromised the protected health information (PHI) of 495,949 individuals. The PHI involved included names, dates of birth, addresses, drivers’ license and Social Security numbers, claims and financial information, lab results, medications, diagnoses, and other treatment information. The CE notified HHS and the affected individuals. In response to the breach, the CE implemented additional administrative, technical, and security safeguards. Staff were retrained on email security.

What is known

People affected495,949 (as reported to HHS)
DisclosedJun 8, 2021
HappenedDec 2, 2020
AttackHacking
Data exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Source
California Attorney General breach notice: UC San Diego Healthoag.ca.gov · Official notice
HHS OCR breach report (archive, resolved): UC San Diego Health (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
HHS archivetotalJun 8, 2021495,949
California AGresidents of CASep 9, 2021

Other breaches at UC San Diego Health

BreachAffected
Disclosed Mar 16, 2023Mar 16, 20233 years agoInsider23K
Disclosed Jun 14, 2019Jun 14, 20197 years agoUnknown
History of this record
  • 2026-09-25 · attack: unknown to hacking · backfill source
  • 2026-09-25 · data_types: [] to ["names","health"] · backfill source
  • 2026-09-25 · records_basis: empty to hhs · backfill source
  • 2026-09-25 · records: empty to 495949 · backfill source
  • 2026-09-25 · disclosed: 2021-09-09 to 2021-06-08 · backfill source
  • 2026-09-25 · summary: empty to The covered entity (CE), UC San Diego Health, reported that an employee was subjected to an email phishing scheme that compromised the protected health information (PHI) of 495,949 individuals. The PHI involved included names, dates of birt · 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.

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