Altos

Disclosed Aug 1, 202515,956 affectedConfirmed

The business associate (BA), Altos reported that it was the subject of a data breach that affected the protected health information (PHI) of 1,634 individuals. The PHI involved included clinical and demographic information. The BA notified HHS and affected individuals. In response to the breach, the BA provided complimentary credit monitoring services to the affected individuals and implemented additional administrative, technical, and security safeguards to better protect PHI.

What is known

People affected	15,956 (as reported by the organization)
Disclosed	Aug 1, 2025
Happened	May 30, 2025
Attack	Hacking
Data exposed	NamesHealth
Sector	Healthcare · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Altos

Official noticein.gov

Indiana Attorney General 2025 data breach report: Altos

Official noticeocrportal.hhs.gov

HHS OCR breach report (archive, resolved): Altos (Business Associate, CA)

Notices filed

Residents of CAAug 1, 2025

California AGCount not stated

Residents of INAug 1, 2025

Indiana AG7 people

TotalAug 11, 2025

HHS archive1,634 people

History of this record

sector2026-09-25

other to healthby backfillSource

attack2026-09-25

unknown to hackingby backfillSource

data_types2026-09-25

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

summary2026-09-25

empty to The business associate (BA), Altos reported that it was the subject of a data breach that affected the protected health information (PHI) of 1,634 individuals. The PHI involved included clinical and demographic information. The BA notified by backfillSource

records_basis2026-09-25

empty to organizationby backfillSource

records2026-09-25

empty to 15956by 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 Altos