HHS OCR report ยท 2021
On Lok Senior Health Services data breach
OCR report facts
- Covered entity
- On Lok Senior Health Services
- Entity type
- Health Plan
- State
- California
- Individuals affected
- 1,643
- Submission date
- Jul 13, 2021
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
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...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the On Lok Senior Health Services data breach?
The report to HHS OCR lists 1,643 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Jul 13, 2021.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from On Lok Senior Health Services legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or On Lok Senior Health Services.