LatestStatesCompaniesPricingAPIData Start free trial

Latest / California / June 2021

Highmark Inc.

Highmark Inc. notified California AG on Jun 24, 2021 of a data breach, which occurred on Dec 23, 2020. Data exposed: Medical / health information, Usernames / passwords, Email address.

All 3 filings by Highmark Inc., state by state · Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization
Highmark Inc.
Source
California AG · source record
Date reported
Jun 24, 2021
Date(s) of breach
Wednesday, December 23, 2020
Residents affected
Not published by this source
Data exposed
Medical / health information Usernames / passwords Email address
Notice letter
Sample notice (PDF)
Discovered
Jan 27, 2021, as stated in the letter
"On January 27, 2021, MultiPlan identified a security matter involving unauthorized access to one of our employee’s email accounts by an outside bad actor."
Days to notice
148 days from discovery (Jan 27, 2021) to the California record (Jun 24, 2021). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82). Over the statutory period
Offered in the letter
24 months of credit or identity monitoring through Experian
Third party
The letter attributes the incident to a vendor or service provider
First seen by BreachTally
2026-10-30 16:06 UTC

Dates and counts as filed by the organization with the agency. The breach window and the report date often differ by months.

First seen by BreachTally at 16:06 UTC on Oct 30, 2026. New filings reach paid subscribers within 30 minutes of the agency posting, with the count, the data exposed and the letter. Start a 14-day free trial. We email you two days before the first charge and you cancel in one click.
Not today? Take the free Monday digest: the week's filings by state and the largest by people affected. Once a week.

Other filings by Highmark Inc.

OrganizationSourceStateReportedResidents affectedData exposed
Highmark, Inc. Delaware DOJ DE Feb 10, 2023 559 Social Security numberFinancial / bank accountMedical / health informationHealth insurance+6
Highmark California AG CA Feb 3, 2023 Not published Social Security numberFinancial / bank accountMedical / health informationUsernames / passwords+4

Data reproduced from a public government filing. Spot an error? Email support@breachtally.com with the record link. Corrections are applied and noted.