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City of Hope

Disclosed Mar 4, 201610 years ago1,024 affectedConfirmed

Official notice

The covered entity (CE), City of Hope, received a phishing email on January 18, 2016, causing unauthorized access to several employee email accounts. The protected health information (PHI) involved in the breach included patients' names, medical record numbers, dates of birth, addresses, email addresses, telephone numbers, clinical information, test results, and dates of service and for one patient, the social security number and financial information. Approximately 1,024 individuals were affected by the breach. The CE provided breach notification to HHS, affected individuals, and the media, and also posted substitute notice. Following the breach, the CE blocked access to a form in the embedded link contained in the phishing email, blocked the sender of the phishing email from sending additional emails, updated its spam filter, removed the email from the inboxes of users who received it, and sent an email to all staff to advise them of the issue. Additionally, the CE began updating its anti-phishing defenses and has upgraded its firewall. OCR provided the CE with technical assistance regarding the Security Rule including risk analysis and risk management.

What is known

People affected1,024 (as reported to HHS)
DisclosedMar 4, 2016
AttackHacking
Data exposedNames, Health
SectorHealthcare · US
StatusConfirmed

Sources

Source
HHS OCR breach report (archive, resolved): City of Hope (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
HHS archivetotalMar 4, 20161,024

Other breaches at City of Hope

BreachAffected
Disclosed Dec 12, 2023Dec 12, 20232 years agoHacking903K
Disclosed Aug 3, 2017Aug 3, 20179 years agoHacking3,400
History of this record
  • 2026-09-25 · added · backfill source

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

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