Every public data breach

44 disclosed this week · 26,355 on record

On Lok Senior Health Services

Disclosed Jul 13, 20211,643 affectedConfirmed

Official notice

The covered entity (CE), On Lok Senior Health Services, reported that it experienced a ransomware attack that affected the electronic protected health information (ePHI) of 1,643 individuals. The ePHI involved included names, dates of birth, addresses, diagnoses/conditions, medications prescribed, and other treatment information. The CE notified HHS, affected individuals, and the media. The CE also created a call center and offered complimentary credit monitoring services. In response to the breach, the CE implemented additional administrative, technical, and security safeguards to better protect its ePHI. OCR provided technical assistance to the CE regarding the HIPAA Security Rule.

What is known

People affected1,643 (as reported to HHS)
DisclosedJul 13, 2021
HappenedMay 14, 2021
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

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 1643by backfillSource
disclosed2026-09-25
2021-08-12 to 2021-07-13by backfillSource
summary2026-09-25
empty to The covered entity (CE), On Lok Senior Health Services, reported that it experienced a ransomware attack that affected the electronic protected health information (ePHI) of 1,643 individuals. The ePHI involved included names, dates of birthby 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 On Lok Senior Health Services