HHS OCR report ยท 2021
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
- 18,913
- Submission date
- Mar 31, 2021
- Type of breach
- Unauthorized Access/Disclosure
- 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 employees of its business associate misconfigured a server and exposed the protected health information (PHI) of 18,913 individuals. The PHI involved included names, Social Security numbers, dates of birth, addresses, financial information, diagnoses, lab results, medications prescribed, and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. In respons...
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 | 73,536 | Sep 14, 2020 | Hacking/IT Incident | 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 18,913 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Mar 31, 2021.
What type of breach was it?
The OCR portal lists the type of breach as Unauthorized Access/Disclosure, 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.