Contra Costa Health Plan
Disclosed Dec 13, 20187 years ago862 affectedConfirmed
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 affected | 862 (as reported to HHS) |
|---|---|
| Disclosed | Dec 13, 2018 |
| Happened | Dec 1, 2014 |
| Attack | Insider |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Contra Costa Health Planoag.ca.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Contra Costa Health Plan (Health Plan, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | Dec 13, 2018 | |
| HHS archivetotal | Dec 13, 2018 | 862 |
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.