Every public data breach

Disclosed this week44On record26,355

44 disclosed this week · 26,355 on record

Stockton Cardiology Medical Group

Disclosed Mar 18, 202690,000 affectedConfirmed

Official notice

What is known

People affected90,000 (as reported to HHS)
DisclosedMar 18, 2026
HappenedDec 15, 2025
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Official noticeoag.ca.gov
California Attorney General breach notice: Stockton Cardiology Medical Group
Official noticeocrportal.hhs.gov
HHS OCR breach report: Stockton Cardiology Medical Group (Healthcare Provider, CA)

Notices filed

TotalMar 18
HHS OCR90,000 people
Residents of CAMar 20
California AGCount not stated
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 90000by backfillSource
disclosed2026-09-25
2026-03-20 to 2026-03-18by 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 Stockton Cardiology Medical Group