HHS OCR report · 2023
City of Hope data breach
OCR report facts
- Covered entity
- City of Hope
- Entity type
- Healthcare Provider
- State
- California
- Individuals affected
- 902,540
- Submission date
- Dec 12, 2023
- 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), City of Hope, reported that it experienced a cyber-attack that affected the protected health information (PHI) of 902,540 individuals. The PHI involved included names, dates of birth, Social Security and drivers’ license numbers, financial and health insurance information, diagnoses, and other treatment information. The CE notified HHS, affected individuals, and the media. In its mitigation efforts, the CE implemented additional administrative, technical, and security...
Text as published on the HHS OCR breach portal.
Other reports by City of Hope
| Covered entity | State | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|---|
| City of Hope | CA | Healthcare Provider | 3,400 | Aug 3, 2017 | Hacking/IT Incident | Archive (closed) |
| City of Hope | CA | Healthcare Provider | 1,024 | Mar 4, 2016 | Hacking/IT Incident | Archive (closed) |
Frequently asked questions
How many people were affected by the City of Hope data breach?
The report to HHS OCR lists 902,540 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Dec 12, 2023.
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 City of Hope 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 City of Hope.