Every public data breach

44 disclosed this week · 26,355 on record

Western Washington Medical Group

Disclosed Oct 26, 2023350,863 affectedConfirmed

Official notice

The covered entity (CE), Western Washington Medical Group, reported that it was the subject of a ransomware attack that affected the protected health information (PHI) of 350,863 individuals. The PHI involved included names, addresses, Social Security numbers, dates of birth, claims information, and diagnoses. The CE notified HHS, the affected individuals, the media, and provided substitute notice. In response to the breach, the CE provided complimentary credit monitoring services and implemented additional administrative, technical, and security safeguards. Staff were retrained on the requirement to protect and secure PHI.

What is known

People affected350,863 (as reported to HHS)
DisclosedOct 26, 2023
DiscoveredSep 25, 2023
HappenedJul 7, 2023
AttackRansomware
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at Western Washington Medical Group

History of this record
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 350863by backfillSource
disclosed2026-09-25
2023-11-08 to 2023-10-26by backfillSource
summary2026-09-25
empty to The covered entity (CE), Western Washington Medical Group, reported that it was the subject of a ransomware attack that affected the protected health information (PHI) of 350,863 individuals. The PHI involved included names, addresses, Sociby backfillSource
attack2026-09-25
unknown to ransomwareby backfillSource
discovered2026-09-25
empty to 2023-09-25by 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.

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