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Regulator-posted notice

Breach notice filed by Prospect Medical Holdings, Inc. (September 2023)

Organization named: Prospect Medical Holdings, Inc. 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 OCR breach portal (HIPAA breaches affecting 500 or more individuals) with a submission date of Sept. 29, 2023.

Organization as reported
Prospect Medical Holdings, Inc., CA
Entity type as reported
Business Associate
Category as reported
Hacking/IT Incident
Location of information as reported
Network Server
Submission date
Sept. 29, 2023
Observed by BreachRecords
2026-10-18 16:15 UTC (revision 10429, row:1568)
Archived copy
Held in the private archive (provenance)

The covered entity (CE), Prospect Medical Holdings, reported that it experienced a ransomware incident that affected the protected health information (PHI) of 1,309,096 individuals. The PHI involved included names, dates of birth, drivers’ license and Social Security numbers, addresses, diagnoses, lab results, medications, claims and financial information, and other treatment information. The CE notified HHS, affected individuals, the media, and posted substitute notice on its website. In response to the breach, the CE offered free credit monitoring and identity theft protection services and implemented new administrative and technical safeguards.

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

Figures, per source

  • 1,309,096 individuals affected (total reported), as reported by the HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals), source date Sept. 29, 2023, 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 at the HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals)
  • Observed by BreachRecords (revision 10429)
  • Approved by a reviewer

Organizations linked by a reviewer

  • Prospect Medical Holdings, Inc. 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, from the HHS OCR breach portal (HIPAA breaches affecting 500 or more individuals), retrieved 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 Prospect Medical Holdings, Inc. (September 2023). We acknowledge every request within two business days. We reply by email.

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