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Regulator-posted notice

Breach notice filed by Marin Cancer Care (February 2026)

Organization named: Marin Cancer Care 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 Feb. 6, 2026.

Organization as reported
Marin Cancer Care, CA
Entity type as reported
Healthcare Provider
Category as reported
Hacking/IT Incident
Location of information as reported
Network Server
Submission date
Feb. 6, 2026
Observed by BreachRecords
2026-10-18 16:15 UTC (revision 9003, row:142)
Archived copy
Held in the private archive (provenance)

The covered entity (CE), Marin Cancer Care, reported that it experienced a cybersecurity incident that affected the protected health information (PHI) of 27,332 individuals. The PHI involved included demographic, clinical, and financial information. The CE notified HHS, affected individuals, and provided media notice. In response to the breach, the CE implemented additional administrative and technical safeguards.

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

Figures, per source

  • 27,332 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date Feb. 6, 2026, 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.

  • Submission date (HHS Office for Civil Rights breach portal)
  • Observed by BreachRecords (revision 9003)
  • Approved by a reviewer

Organizations linked by a reviewer

  • Marin Cancer Care 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.

Request a correction

A record that disagrees with its source, names the wrong organization or duplicates another is corrected after review. This form is about Breach notice filed by Marin Cancer Care (February 2026). We acknowledge every request within two business days. We reply by email.

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