UCLA Health

Disclosed Jul 17, 20154,500,000 affectedConfirmed

Hackers access UCLA Health network holding data of 4.5 million patients

A hacker accessed parts of UCLA Health's network containing clinical and demographic information of about 4.5 million people. UCLA Health reported it to the FBI, ran a forensic review and notified patients.

What is known

People affected	4,500,000 (as reported by the organization)
Disclosed	Jul 17, 2015
Happened	Sep 21, 2014
Attack	Hacking
Data exposed	NamesHealthOtherSocial Security numbers
Sector	Healthcare · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: UCLA Health

Regulatorocrportal.hhs.gov

HHS Office for Civil Rights breach portal (archive): Breaches Affecting 500 or More Individuals

Official noticein.gov

Indiana Attorney General 2015 data breach report: UCLA Health

Official noticemaine.gov

Maine Attorney General breach notice archive: UCLA Health

Notices filed

Residents of CAJul 17, 2015

California AGCount not stated

TotalJul 17, 2015

Research4,500,000 people

Residents of INJul 17, 2015

Indiana AG1,677 people

Residents of MEJul 17, 2015

Maine AG423 people

Other breaches at UCLA Health

Breach, details not statedBreach notice filed with the California AG, details not stated.HealthcareUSAug 4 Insider breachInsider exposed names and health records. Reported to the HHS archive.94K affectedHealthcareUSSep 8, 2022

History of this record

data_types2026-09-25

["names","health","other"] to ["names","health","other","ssn"]by backfillSource

source2026-09-25

empty to https://www.in.gov/attorneygeneral/consumer-protection-division/id-theft-prevention/files/DB-Year-to-date-Report-2015.pdfby backfillSource

attack2026-09-25

unknown to hackingby seedSource

data_types2026-09-25

[] to ["names","health","other"]by seedSource

records_basis2026-09-25

empty to organizationby seedSource

records2026-09-25

empty to 4500000by seedSource

summary2026-09-25

empty to A hacker accessed parts of UCLA Health's network containing clinical and demographic information of about 4.5 million people. UCLA Health reported it to the FBI, ran a forensic review and notified patients.by seedSource

title2026-09-25

empty to Hackers access UCLA Health network holding data of 4.5 million patientsby seedSource

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.

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