Every public data breach

47 disclosed this week · 26,367 on record

Hematology Oncology Associates

Disclosed May 21, 201916,073 affectedConfirmed

Official notice

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 affected16,073 (as reported to HHS)
DisclosedMay 21, 2019
DiscoveredMar 19, 2019
HappenedDec 18, 2018
AttackHacking
Data exposedNamesHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
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 16073by backfillSource
summary2026-09-25
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 includedby backfillSource
discovered2026-09-25
empty to 2019-03-19by 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 Hematology Oncology Associates