Hematology Oncology Associates
Disclosed May 21, 20197 years ago16,073 affectedConfirmed
Hematology Oncology Associates, the covered entity (CE), reported that an employee was the victim of an email phishing scheme that affected the electronic protected health information (ePHI) of 17,213 individuals. The ePHI involved included names, addresses, birthdates, drivers’ license information, Social Security numbers, claims information, financial data, diagnoses/conditions, lab results, medications prescribed, and other treatment information. The CE notified HHS, affected individuals, and the media. In its mitigation efforts, the CE implemented additional administrative and technical safeguards and retrained its staff. In response to OCR’s investigation, the CE implemented enhanced security measures, including implementing a new security environment and updating information security policies and procedures.
What is known
| People affected | 16,073 (as reported to HHS) |
|---|---|
| Disclosed | May 21, 2019 |
| Discovered | Mar 19, 2019 |
| Happened | Dec 18, 2018 |
| Attack | Hacking |
| Data exposed | Names, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Hematology Oncology Associatesoag.ca.gov · Official notice | Official notice |
| Oregon DOJ breach notice: Hematology Oncology Associatesjustice.oregon.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Hematology Oncology Associates (Healthcare Provider, OR)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | May 21, 2019 | |
| HHS archivetotal | May 21, 2019 | 16,073 |
| Oregon DOJresidents of OR | May 28, 2019 | 16,073 |
History of this record
- 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 16073 · backfill source
- 2026-09-25 · summary: empty to Hematology Oncology Associates, the covered entity (CE), reported that an employee was the victim of an email phishing scheme that affected the electronic protected health information (ePHI) of 17,213 individuals. The ePHI involved included · backfill source
- 2026-09-25 · discovered: empty to 2019-03-19 · 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.