Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

Health Plan of San Mateo

Disclosed Jun 29, 2011694 affectedConfirmed

Official notice

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What is known

People affected694 (as reported to HHS)
DisclosedJun 29, 2011
AttackInsider
Data exposedNamesHealth
SectorInsurance · US
StatusConfirmed

Sources

Official noticeocrportal.hhs.gov
HHS OCR breach report (archive, resolved): Health Plan of San Mateo (Health Plan, CA)

Notices filed

TotalJun 29, 2011
HHS archive694 people

Other breaches at Health Plan of San Mateo

Hacking breachHacking exposed names and health records. Reported to the California AG.12K affectedHealthcareUSJan 18, 2023
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 Health Plan of San Mateo