HHS OCR report · 2018
Guardant Health, Inc. data breach
OCR report facts
- Covered entity
- Guardant Health, Inc.
- Entity type
- Healthcare Provider
- State
- California
- Individuals affected
- 1,112
- Submission date
- Sep 14, 2018
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Business associate present
- No
- Status
- Archive (closed)
OCR description
A hacker attacked the covered entity’s (CE) computer system via a phishing email, potentially affecting the protected health information (PHI) of 1,112 individuals. The types of PHI involved in the breach included demographic, clinical, and health insurance information. The CE provided breach notification to HHS and affected individuals. OCR obtained evidence of the CE’s risk analysis and safeguards implemented prior to the breach. As a result of OCR’s investigation, the CE strengthened i...
Text as published on the HHS OCR breach portal.
Other reports by Guardant Health, Inc.
| Covered entity | State | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|---|
| Guardant Health, Inc. | CA | Healthcare Provider | 9,309 | Apr 26, 2024 | Unauthorized Access/Disclosure | Archive (closed) |
Frequently asked questions
How many people were affected by the Guardant Health, Inc. data breach?
The report to HHS OCR lists 1,112 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Sep 14, 2018.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Email.
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 Guardant Health, Inc. 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 Guardant Health, Inc..