HHS OCR report ยท 2020
Memorial Sloan Kettering Cancer Center data breach
OCR report facts
- Covered entity
- Memorial Sloan Kettering Cancer Center
- Entity type
- Healthcare Provider
- State
- New York
- Individuals affected
- 73,536
- Submission date
- Sep 14, 2020
- 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), Memorial Sloan Kettering Cancer Center, reported that is business associate experienced a ransomware attack that affected the electronic protected health information (ePHI) of 73,536 individuals. The ePHI involved included names, mailing addresses, email addresses, dates of birth, and telephone numbers. The CE notified HHS, affected individuals, and the media.
Text as published on the HHS OCR breach portal.
Other reports by Memorial Sloan Kettering Cancer Center
| Covered entity | State | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|---|
| Memorial Sloan Kettering Cancer Center | NY | Healthcare Provider | 12,274 | Jun 25, 2024 | Hacking/IT Incident | Archive (closed) |
| Memorial Sloan Kettering Cancer Center | NY | Healthcare Provider | 18,913 | Mar 31, 2021 | Unauthorized Access/Disclosure | Archive (closed) |
Frequently asked questions
How many people were affected by the Memorial Sloan Kettering Cancer Center data breach?
The report to HHS OCR lists 73,536 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Sep 14, 2020.
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 Memorial Sloan Kettering Cancer Center 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 Memorial Sloan Kettering Cancer Center.