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Latest / California / November 2021

Quest Diagnostics

Quest Diagnostics notified California AG on Nov 16, 2021 of a data breach, which occurred on Oct 29, 2021. Data exposed: Social Security number, Email address, Postal address, Name.

All 4 filings by Quest Diagnostics, state by state · Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization
Quest Diagnostics
Source
California AG · source record
Date reported
Nov 16, 2021
Date(s) of breach
Friday, October 29, 2021
Residents affected
Not published by this source
Data exposed
Social Security number Email address Postal address Name
Notice letter
Sample notice (PDF)
Days to notice
18 days from the end of the breach window (Oct 29, 2021, no discovery date in the letter) to the California record (Nov 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
First seen by BreachTally
2026-10-30 16:05 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 16:05 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.
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Other filings by Quest Diagnostics

OrganizationSourceStateReportedResidents affectedData exposed
Quest Diagnostics Oregon DOJ OR Dec 12, 2016 34,055 Not stated
Quest Diagnostics California AG CA Dec 12, 2016 Not published Social Security numberFinancial / bank accountMedical / health informationDate of birth+3
Quest Diagnostics California AG CA Dec 19, 2014 Not published In the letter (PDF)

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