Guidehouse on behalf of Community Memorial Health System located in Ventura, CA

Guidehouse on behalf of Community Memorial Health System located in Ventura, CA notified California AG on Jul 16, 2021 of a data breach, which occurred on Jan 20, 2021. Data exposed: Medical / health information, Health insurance, Date of birth, Postal address, Name.

Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization: Guidehouse on behalf of Community Memorial Health System located in Ventura, CA
Source: California AG · source record
Date reported: Jul 16, 2021
Date(s) of breach: Wednesday, January 20, 2021
Residents affected: Not published by this source
Data exposed: Medical / health information Health insurance Date of birth Postal address Name
Notice letter: Sample notice (PDF)
Discovered: March 2021, as stated in the letter
"We recently learned in late March 2021 that we had been the victim of a cyber attack."
Days to notice: 177 days from the end of the breach window (Jan 20, 2021, no discovery date in the letter) to the California record (Jul 16, 2021). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82).
Offered in the letter: 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.

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