On Lok Senior Health Services
Disclosed Jul 13, 20215 years ago1,643 affectedConfirmed
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 affected | 1,643 (as reported to HHS) |
|---|---|
| Disclosed | Jul 13, 2021 |
| Happened | May 14, 2021 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: On Lok Senior Health Servicesoag.ca.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): On Lok Senior Health Services (Health Plan, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Jul 13, 2021 | 1,643 |
| California AGresidents of CA | Aug 12, 2021 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: [] to ["names","health"] · backfill source
- 2026-09-25 · records_basis: empty to hhs · backfill source
- 2026-09-25 · records: empty to 1643 · backfill source
- 2026-09-25 · disclosed: 2021-08-12 to 2021-07-13 · backfill source
- 2026-09-25 · summary: 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 birth · backfill source
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.