Regulator-posted notice

Breach notice filed by Cancer Centers of Southwest Oklahoma, LLC (June 2021)

Organization named: Cancer Centers of Southwest Oklahoma, LLC 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 Office for Civil Rights breach portal with a submission date of June 4, 2021.

Organization as reported: Cancer Centers of Southwest Oklahoma, LLC, OK
Entity type as reported: Healthcare Provider
Category as reported: Hacking/IT Incident
Location of information as reported: Electronic Medical Record, Network Server
Submission date: June 4, 2021
Observed by BreachRecords: 2026-10-18 16:15 UTC (revision 12102, row:3241)
Archived copy: Held in the private archive (provenance)

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.
The source's own words, from the revision above.

Figures, per source

8,000 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date June 4, 2021, 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.

2021-06-04Submission date (HHS Office for Civil Rights breach portal)
2026-10-18Observed by BreachRecords (revision 12102)
2026-10-19Approved by a reviewer

Organizations linked by a reviewer

Cancer Centers of Southwest Oklahoma, LLC 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, retrieved from HHS Office for Civil Rights breach portal, 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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