HHS OCR report · 2019
AltaMed Health Services Corporation data breach
OCR report facts
- Covered entity
- AltaMed Health Services Corporation
- Entity type
- Healthcare Provider
- State
- California
- Individuals affected
- 5,500
- Submission date
- Apr 18, 2019
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- Yes
- Status
- Archive (closed)
OCR description
The covered entity (CE), AltaMed Health Services Corporation, reported that its business associate (BA), Centrelake Medical Group, Inc., experienced a ransomware attack that affected the protected health information (PHI) of 5,650 individuals. The PHI involved included names, addresses, phone numbers, drivers’ license information, Social Security numbers, claims information, diagnoses/conditions, and treatment information. The CE notified HHS, affected individuals, the media, and provided s...
Text as published on the HHS OCR breach portal.
Other reports by AltaMed Health Services Corporation
| Covered entity | State | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|---|
| AltaMed Health Services Corporation | CA | Healthcare Provider | 501 | Feb 26, 2026 | Hacking/IT Incident | Under investigation |
| AltaMed Health Services Corporation | CA | Healthcare Provider | 4,530 | Jun 13, 2025 | Unauthorized Access/Disclosure | Under investigation |
| AltaMed Health Services Corporation | CA | Healthcare Provider | 6,000 | Feb 15, 2019 | Hacking/IT Incident | Archive (closed) |
| AltaMed Health Services Corporation | CA | Healthcare Provider | 3,206 | Aug 29, 2014 | Theft | Archive (closed) |
Frequently asked questions
How many people were affected by the AltaMed Health Services Corporation data breach?
The report to HHS OCR lists 5,500 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Apr 18, 2019.
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 AltaMed Health Services Corporation 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 AltaMed Health Services Corporation.