Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Alameda Health System

Disclosed Sep 15, 20202,691 affectedConfirmed

Official notice

What is known

People affected2,691 (as reported to HHS)
DisclosedSep 15, 2020
HappenedApr 30, 2020
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Alameda Health System
Official noticeocrportal.hhs.gov
HHS OCR breach report (archive, resolved): Alameda Health System (Healthcare Provider, CA)

Notices filed

TotalSep 15, 2020
HHS archive2,691 people
Residents of CAOct 22, 2020
California AGCount not stated
Residents of CAJun 24, 2022
California AGCount not stated

Other breaches at Alameda Health System

Hacking breachHacking exposed names and health records. Reported to the HHS archive.90K affectedHealthcareUSMay 20, 2022
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 2691by backfillSource
disclosed2026-09-25
2020-10-22 to 2020-09-15by backfillSource
disclosed2026-09-25
2022-06-24 to 2020-10-22by 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.

Everything about Alameda Health System