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Contra Costa Health Plan

Disclosed Dec 13, 20187 years ago862 affectedConfirmed

Official notice

On May 22, 2018, the covered entity (CE), Contra Costa Health Plan, discovered that a business associate (BA) had provided services under a false identity. The CE investigated and determined that during her work for the CE the BA had access to 862 health plan enrollees’ protected health information (PHI), including demographic and clinical information. Following the breach, the CE immediately terminated the BA contract and the individual contractor’s access to the CE’s records. The CE conducted a thorough forensic audit trail investigation and did not find any evidence of improper access, use, or disclosure of enrollee PHI by the contractor. The CE provided breach notification to HHS, affected individuals, and the media. OCR obtained assurances that the CE implemented the corrective actions listed above.

What is known

People affected862 (as reported to HHS)
DisclosedDec 13, 2018
HappenedDec 1, 2014
AttackInsider
Data exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Source
California Attorney General breach notice: Contra Costa Health Planoag.ca.gov · Official notice
HHS OCR breach report (archive, resolved): Contra Costa Health Plan (Health Plan, CA)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
California AGresidents of CADec 13, 2018
HHS archivetotalDec 13, 2018862
History of this record
  • 2026-09-25 · attack: unknown to insider · backfill source
  • 2026-09-25 · data_types: [] to ["names","health"] · backfill source
  • 2026-09-25 · records_basis: empty to hhs · backfill source
  • 2026-09-25 · records: empty to 862 · backfill source
  • 2026-09-25 · summary: empty to On May 22, 2018, the covered entity (CE), Contra Costa Health Plan, discovered that a business associate (BA) had provided services under a false identity. The CE investigated and determined that during her work for the CE the BA had access · backfill source
  • 2026-09-25 · added · backfill source

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

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