Quantum Health

Disclosed Jul 29, 20261,911,559 affectedConfirmed

What is known

People affected	1,911,559 (as reported by the organization)
Disclosed	Jul 29, 2026
Discovered	Jun 1, 2026
Happened	May 29, 2026
Attack	Hacking
Data exposed	NamesHealthSocial Security numbersInsurance
Sector	Healthcare · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Quantum Health

Official noticeatg.wa.gov

Washington Attorney General breach notice: Quantum Health

Official noticejustice.oregon.gov

Oregon DOJ breach notice: Quantum Health

Official noticeocrportal.hhs.gov

HHS OCR breach report: Quantum Health (Business Associate, OH)

Official noticeoag.my.site.com

Texas Attorney General data security breach report BR-0005262: Quantum Health

Official noticeago.vermont.gov

Vermont Attorney General breach report: Quantum Health

Notices filed

TotalJul 29

HHS OCR2,104 people

Residents of CAAug 14

California AGCount not stated

Residents of WAAug 14

Washington AG5,909 people

Residents of ORAug 14

Oregon DOJ184,376 people

Residents of TXAug 18

Texas AG68,451 people

Residents of CAOct 27

California AGCount not stated

Residents of TXOct 28

Texas AG273,111 people

Residents of VTOct 28

Vermont AG2,360 people

Other breaches at Quantum Health

Breach, details not statedBreach notice filed with the Indiana AG, details not stated.737 affectedHealthcareUSMar 17, 2017

History of this record

source2026-10-29

empty to https://ago.vermont.gov/categories/security-breach-noticesby dailySource

records2026-10-29

625945 to 1911559by dailySource

data_types2026-09-25

["names","health"] to ["names","health","ssn","insurance"]by backfillSource

records_basis2026-09-25

hhs to organizationby backfillSource

records2026-09-25

2104 to 625945by backfillSource

data_types2026-09-25

[] to ["names","health"]by backfillSource

records_basis2026-09-25

empty to hhsby backfillSource

records2026-09-25

empty to 2104by backfillSource

disclosed2026-09-25

2026-08-14 to 2026-07-29by backfillSource

attack2026-09-25

unknown to hackingby backfillSource

discovered2026-09-25

empty to 2026-06-01by backfillSource

Added2026-09-25

First recordedby backfillSource

First seen 2026-09-25 (California AG), confirmed by California AG. Record counts are as reported. Not legal advice.

Everything about Quantum Health