Cancer Centers of Southwest Oklahoma
Disclosed Jun 4, 20215 years ago8,000 affectedConfirmed
The covered entity (CE), Cancer Centers of Southwest Oklahoma, LLC, reported that its business associate (BA) experienced a ransomware attack that compromised the electronic protected health information (ePHI) of 6,253 individuals. The ePHI involved included names, addresses, dates of birth, driver’s license numbers, Social Security numbers, medications prescribed, lab results, and diagnoses/conditions. The CE notified HHS, affected individuals, and the media.
What is known
| People affected | 8,000 (as reported to HHS) |
|---|---|
| Disclosed | Jun 4, 2021 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| HHS OCR breach report (archive, resolved): Cancer Centers of Southwest Oklahoma (Healthcare Provider, OK)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS archivetotal | Jun 4, 2021 | 8,000 |
History of this record
- 2026-09-25 · added · backfill source
First seen 2026-09-25 (HHS archive), confirmed by HHS OCR. Record counts are as reported. Not legal advice.