United States of America
Quest Diagnostics is an organisation in California. It appears on the Massachusetts Attorney General breach-notification register and the California Attorney General breach-notification register with 4 confirmed incidents (5 filings); the most recent notice was filed on April 5, 2023.
Data as of August 31, 2026.
Required under M.G.L. c. 93H. Notice to the Attorney General is required for a breach affecting any number of Massachusetts residents' personal information -- the statute sets no minimum count.
Note: the count is Massachusetts residents only, not a total.
The same incident was filed separately with 2 jurisdictions within a few days of each other (CA and MA) — shown here as one incident.
Required under Cal. Civ. Code §1798.82. A copy of the notification must be sent to the Attorney General when a single breach requires notifying more than 500 California residents.
Note: no affected-count is published on this register.
CA AG breach notification: an unknown number of California residents affected
sourceCA AG breach notification: an unknown number of California residents affected
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