Partnership HealthPlan of California
Disclosed Sep 4, 20263 weeks ago1,526 affectedConfirmed
Partnership HealthPlan mailings sent other members' health plan data
Partnership HealthPlan of California said some PCP selection forms and welcome packets mailed between May 13 and July 8, 2026 contained names, birth dates and member ID numbers of unrelated members. SSNs and ID numbers were not involved.
What is known
| People affected | 1,526 (as reported to HHS) |
|---|---|
| Disclosed | Sep 4, 2026 |
| Discovered | Jul 7, 2026 |
| Happened | May 13, 2026 |
| Attack | Insider |
| Data exposed | Names, Health, Dates of birth, Insurance |
| Sector | Insurance · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Partnership HealthPlan of Californiaoag.ca.gov · Official notice | Official notice |
| HHS OCR breach report: Partnership HealthPlan of California (Health Plan, CA)ocrportal.hhs.gov · Official notice | Official notice |
| California AG breach report: Partnership HealthPlan of Californiaoag.ca.gov · Regulator | Regulator |
| Partnership HealthPlan notification letteroag.ca.gov · Regulator | Regulator |
Notices filed
| Where | Filed | People |
|---|---|---|
| HHS OCRtotal | Sep 4 | 1,526 |
| California AGresidents of CA | Sep 17 | |
| Researchtotal | Sep 17 |
Other breaches at Partnership HealthPlan of California
| Breach | Affected | ||||
|---|---|---|---|---|---|
| Disclosed May 18, 2022May 18, 20224 years agoRansomware | May 18, 20224 years ago | Ransomware | Healthcare | Confirmed | 855K |
History of this record
- 2026-09-25 · sector: health to insurance · seed source
- 2026-09-25 · data_types: ["names","health"] to ["names","health","dob","insurance"] · seed source
- 2026-09-25 · discovered: empty to 2026-07-07 · seed source
- 2026-09-25 · summary: empty to Partnership HealthPlan of California said some PCP selection forms and welcome packets mailed between May 13 and July 8, 2026 contained names, birth dates and member ID numbers of unrelated members. SSNs and ID numbers were not involved. · seed source
- 2026-09-25 · title: empty to Partnership HealthPlan mailings sent other members' health plan data · seed source
- 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 1526 · backfill source
- 2026-09-25 · disclosed: 2026-09-17 to 2026-09-04 · 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.