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Confirmed breach

Partnership HealthPlan of California data breach

USUnited States

Partnership HealthPlan of California (United States) notified the California Attorney General of a data breach on 17 September 2026. The breach began on 13 May 2026, 127 days before it was reported.

Status
Confirmed breach
People affected
Not reported yet
Reported
17 September 2026
Breach began
13 May 2026
Found to notice
72 days (found 7 July 2026, by the company’s letter)
Time to tell
127 days (the median in California’s notices over the last year: 154 days)

What was exposed

The register’s list does not say what was exposed; the notice it links to (under Sources) usually does.

How it happened

How
Other some mailings sent between May 13, 2026, and July 8, 2026, contained information belonging to unrelated members source

What the letter says

Found
On July 7, 2026, we discovered a privacy incident
Began
some mailings sent between May 13, 2026, and July 8, 2026

Got a letter or email about this breach? Check it is real →

Read the letter (PDF), as filed with the California Attorney General.

Sources

Official notices are read by code from the regulator’s own register. More notices to California. · Corrections and changes

If Partnership HealthPlan of California had your data

  1. Look for Partnership HealthPlan of California’s own notice or letter: it should say what of yours was involved. Keep it.
  2. The register’s list does not say what was exposed; the notice it links to (under Sources) usually does. If Partnership HealthPlan of California has a password of yours, change it now to be safe.
  3. Expect scams that use your details: calls, texts or emails pretending to be Partnership HealthPlan of California, your bank or the police. Never give codes or passwords, never approve a sign-in you did not start, never move money.

One email to confirm first. We use your address only for this alert, and one click deletes it.

Earlier breaches at Partnership HealthPlan of California

From the official registers’ and Have I Been Pwned’s full histories. A name match: check the notice to be sure it is the same company.

  1. California Attorney General · began 19 March 2022
  2. Washington Attorney General · 1,352 Washington residents

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Every breach in United States →

From the data breach tracker: official notices, breach databases and the news, every fact with its source. Open data (CC BY 4.0) · How the tracker works · Official registers · Corrections and changes · Found a mistake? Tell us and we correct it.