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Latest / California / August 2026

Quantum Health, Inc.

Quantum Health, Inc. notified California AG on Aug 14, 2026 of a data breach, which occurred on Jun 1, 2026. Data exposed: Social Security number, Medical / health information, Health insurance, Date of birth, Email address, Phone number, Postal address, Name.

All 9 filings by Quantum Health, Inc., state by state · Case file (dates, days to notice against the statute, what the letter offers, prior incidents)

Organization
Quantum Health, Inc.
Source
California AG · source record
Date reported
Aug 14, 2026
Date(s) of breach
Friday, May 29, 2026Monday, June 1, 2026
Residents affected
Not published by this source
Data exposed
Social Security number Medical / health information Health insurance Date of birth Email address Phone number Postal address Name
Notice letter
Sample notice (PDF)
Discovered
Jun 1, 2026, as stated in the letter
"What Happened?: On June 1, 2026, Quantum Health detected a service outage, which affected the availability of certain internal and external systems."
Days to notice
74 days from discovery (Jun 1, 2026) to the California record (Aug 14, 2026). Statute: 30 days from discovery or notification of the breach (Cal. Civ. Code § 1798.82). Over the statutory period
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 15:26 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 15:26 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 Quantum Health, Inc.

OrganizationSourceStateReportedResidents affectedData exposed
Quantum Health, Inc. Vermont AG VT Oct 28, 2026 2,360 Social Security numberMedical / health information
Quantum Health, Inc. Texas AG TX Oct 28, 2026 273,111 Social Security numberMedical / health informationHealth insuranceName
Quantum Health, Inc. California AG CA Oct 27, 2026 Not published Social Security numberMedical / health informationHealth insuranceDate of birth+4
Quantum Health, Inc. Oregon DOJ OR Aug 14, 2026 184,376 Not stated
Quantum Health, Inc. Washington AG WA Aug 14, 2026 5,909 Social Security numberMedical / health informationHealth insuranceDate of birth+1
Quantum Health, Inc. Massachusetts OCABR MA Jul 30, 2026 33,912 Social Security numberMedical / health information
Quantum Health HHS OCR US Jul 29, 2026 2,104 Medical / health information
Quantum Health, Inc. Massachusetts OCABR MA Feb 18, 2026 653 Social Security number

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