Centrelake Medical Group
Disclosed Apr 16, 20197 years ago197,661 affectedConfirmed
Centrelake Medical Group, Inc., a business associate (BA), reported that it was the victim of cyber-attack involving ransomware that affected the protected health information (PHI) of 197,661 individuals. The PHI involved included names, addresses, phone numbers, drivers’ license information, Social Security numbers, claims information, diagnoses/conditions, and treatment information. The BA notified HHS, affected covered entities, affected individuals, the media, and provided substitute notice. The BA also provided complimentary credit monitoring and identity restoration services to affected individuals. In its mitigation efforts, the BA implemented additional administrative, technical, and security safeguards to better protect its PHI. During the investigation, OCR provided the BA with technical assistance regarding its security management process.
What is known
| People affected | 197,661 (as reported by the organization) |
|---|---|
| Disclosed | Apr 16, 2019 |
| Discovered | Feb 19, 2019 |
| Happened | Jan 9, 2019 |
| Attack | Hacking |
| Data exposed | Names, Social Security numbers, Government IDs, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Centrelake Medical Groupoag.ca.gov · Official notice | Official notice |
| Indiana Attorney General 2019 data breach report: Centrelake Medical Groupin.gov · Official notice | Official notice |
| Maine Attorney General breach notice archive: Centrelake Medical Groupmaine.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Centrelake Medical Group (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | Apr 16, 2019 | |
| Indiana AGresidents of IN | Apr 16, 2019 | 25 |
| Maine AGresidents of ME | Apr 16, 2019 | 4 |
| HHS archivetotal | Apr 16, 2019 | 197,661 |
History of this record
- 2026-09-25 · attack: unknown to hacking · backfill source
- 2026-09-25 · data_types: ["names","ssn","government-id"] to ["names","ssn","government-id","health"] · backfill source
- 2026-09-25 · summary: empty to Centrelake Medical Group, Inc., a business associate (BA), reported that it was the victim of cyber-attack involving ransomware that affected the protected health information (PHI) of 197,661 individuals. The PHI involved included names, ad · backfill source
- 2026-09-25 · data_types: [] to ["names","ssn","government-id"] · backfill source
- 2026-09-25 · discovered: empty to 2019-02-19 · backfill source
- 2026-09-25 · records_basis: empty to organization · backfill source
- 2026-09-25 · records: empty to 197661 · 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.