Every public data breach

44 disclosed this week · 26,355 on record

AltaMed Health Services

Disclosed Feb 15, 20196,000 affectedConfirmed

Official notice

The covered entity (CE), AltaMed Health Services Corporation, reported that its business associate (BA), Centrelake Medical Group, Inc., experienced a ransomware attack that affected the protected health information (PHI) of 5,650 individuals. The PHI involved included names, addresses, phone numbers, drivers’ license information, Social Security numbers, claims information, diagnoses/conditions, and treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice. In its mitigation efforts, the BA provided one year of free credit monitoring and identity restoration services to affected individuals and implemented additional technical and security safeguards to better protect PHI. AltaMed reported this incident to HHS, health plans that were affected by this incident, as well as the California Attorney General, and California Department of Public Health. OCR obtained assurances that AHS and BA implemented the corrective actions noted.

What is known

People affected6,000 (as reported to HHS)
DisclosedFeb 15, 2019
HappenedMay 21, 2018
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

Other breaches at AltaMed Health Services

History of this record
records2026-09-25
5500 to 6000by backfillSource
attack2026-09-25
unknown to hackingby backfillSource
data_types2026-09-25
[] to ["names","health"]by backfillSource
records_basis2026-09-25
empty to hhsby backfillSource
records2026-09-25
empty to 5500by backfillSource
summary2026-09-25
empty to The covered entity (CE), AltaMed Health Services Corporation, reported that its business associate (BA), Centrelake Medical Group, Inc., experienced a ransomware attack that affected the protected health information (PHI) of 5,650 individuaby backfillSource
disclosed2026-09-25
2019-05-15 to 2019-02-15by backfillSource
disclosed2026-09-25
2019-05-30 to 2019-05-15by 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 AltaMed Health Services