Every public data breach

Disclosed this week47On record26,367

47 disclosed this week · 26,367 on record

Highmark

Disclosed Jun 24, 20215,921 affectedConfirmed

Official notice

What is known

People affected5,921 (as reported by the organization)
DisclosedJun 24, 2021
HappenedDec 23, 2020
AttackNot stated
Data exposedNot stated
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Highmark
Official noticein.gov
Indiana Attorney General 2021 data breach report: Highmark

Notices filed

Residents of CAJun 24, 2021
California AGCount not stated
Residents of INJun 30, 2021
Indiana AG4 people

Other breaches at Highmark

Insider breachInsider exposed names and health records. Reported to the HHS archive.6,205 affectedInsuranceUSMar 29, 2024Phishing breachPhishing exposed names, health records and insurance details. Reported to the California AG.1.1M affectedHealthcareUSMar 11, 2022Lost or stolen device breachLost or stolen device exposed names and health records. Reported to the HHS archive.2,589 affectedHealthcareUSJul 8, 2014
History of this record
sector2026-09-25
other to healthby backfillSource
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 5921by 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 Highmark