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Regulator-posted notice

Breach notice filed by Onsite Mammography (April 2025)

Organization named: Onsite Mammography 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 April 21, 2025.

Organization as reported
Onsite Mammography, MA
Entity type as reported
Business Associate
Category as reported
Hacking/IT Incident
Location of information as reported
Email
Submission date
April 21, 2025
Observed by BreachRecords
2026-10-18 16:15 UTC (revision 9334, row:473)
Archived copy
Held in the private archive (provenance)

Onsite Mammography, the covered entity (CE), reported that an employee was the target of an email phishing scheme that impacted the protected health information (PHI) of 357,265 individuals. The PHI involved demographic and treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. In its mitigation efforts, the CE implemented additional administrative and technical safeguards.

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

Figures, per source

  • 357,265 individuals affected (total reported), according to the HHS Office for Civil Rights breach portal, source date April 21, 2025, 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 9334)
  • Approved by a reviewer

Organizations linked by a reviewer

  • Onsite Mammography Named as a service provider 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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