Regulator-posted notice

Breach notice filed by Guardant Health, Inc. (September 2018)

Organization named: Guardant Health, Inc. Provisional: identity as filed, not yet matched to the directory
Type as the source lists it: Hacking/IT Incident

What the sources say

HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals) Primary notice

Posted on the HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals) with a submission date of Sept. 14, 2018.

Organization as reported: Guardant Health, Inc., CA
Entity type as reported: Healthcare Provider
Category as reported: Hacking/IT Incident
Location of information as reported: Email
Submission date: Sept. 14, 2018
Observed by BreachRecords: 2026-10-18 16:15 UTC (revision 13689, row:4828)
Archived copy: Held in the private archive (provenance)

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 its administrative and technical safeguards, including providing additional workforce member training to identify phishing attempts, implementing multi-factor authentication to its email account, adding enhanced email monitoring, and increasing password complexity.
The source's own words, from the revision above.

Figures, per source

1,112 individuals affected (total reported), as reported by the HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals), source date Sept. 14, 2018, revision observed 2026-10-18.

Each figure is one source's figure with the basis that source gave. Figures from different sources are shown side by side and are not added, averaged or chosen between.

Timeline

Source dates are the dates the sources give. Observation dates are when BreachRecords recorded each revision.

2018-09-14Submission date at the HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals)
2026-10-18Observed by BreachRecords (revision 13689)
2026-10-19Approved by a reviewer

Organizations linked by a reviewer

Guardant Health, Inc. Named as the covered entity Provisional: identity as filed, not yet matched to the directory Linked 2026-10-19, method provisional.

Archived evidence

3dbc27dd5742e041cc1e7fe18cc669e2901fbd3b86b7007ed27948ff4d406e1f
text/csv, 5,530,996 bytes, from the HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals), retrieved 2026-10-18 16:15 UTC. Archived privately · Provenance · Source page

Records reflect source filings as of the dates shown. BreachRecords is not a regulator.

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