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AltaMed Health Services

Disclosed Feb 15, 20197 years ago6,000 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 exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

WhereFiledPeople
California AGresidents of CAFeb 15, 2019
HHS archivetotalFeb 15, 20196,000
HHS archivetotalApr 18, 20195,500
California AGresidents of CAMay 15, 2019
California AGresidents of CAMay 30, 2019

Other breaches at AltaMed Health Services

BreachAffected
Disclosed Jun 13, 2025Jun 13, 20251 year agoHacking4,530
Disclosed Jun 29, 2023Jun 29, 20233 years agoUnknown
Disclosed Aug 29, 2014Aug 29, 201412 years agoLost or stolen device3,206
History of this record
  • 2026-09-25 · records: 5500 to 6000 · backfill source
  • 2026-09-25 · attack: unknown to hacking · backfill source
  • 2026-09-25 · data_types: [] to ["names","health"] · backfill source
  • 2026-09-25 · records_basis: empty to hhs · backfill source
  • 2026-09-25 · records: empty to 5500 · backfill source
  • 2026-09-25 · summary: 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 individua · backfill source
  • 2026-09-25 · disclosed: 2019-05-15 to 2019-02-15 · backfill source
  • 2026-09-25 · disclosed: 2019-05-30 to 2019-05-15 · backfill source
  • 2026-09-25 · added · backfill source

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

Everything about AltaMed Health Services

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