Western Health Advantage

Disclosed Dec 13, 2019869 affectedConfirmed

Cognizant TriZetto Software Group, Inc., a business associate (BA) of Western Health Advantage, experienced a communication error while performing routine maintenance on its servers which allowed another covered entity to inadvertently download the electronic protected health information (ePHI) of 869 individuals. The ePHI involved included names, birthdates, addresses, diagnoses, clinical information, and other treatment information. The CE notified HHS, affected individuals, and the media. In its mitigation efforts, the BA implemented additional technical safeguards to better protect its ePHI.

What is known

People affected	869 (as reported to HHS)
Disclosed	Dec 13, 2019
Happened	Oct 20, 2019
Attack	Insider
Data exposed	NamesHealth
Sector	Healthcare · US
Status	Confirmed

Sources

Official noticeoag.ca.gov

California Attorney General breach notice: Western Health Advantage

Official noticeocrportal.hhs.gov

HHS OCR breach report (archive, resolved): Western Health Advantage (Health Plan, CA)

Notices filed

Residents of CADec 13, 2019

California AGCount not stated

TotalDec 13, 2019

HHS archive869 people

History of this record

attack2026-09-25

unknown to insiderby backfillSource

data_types2026-09-25

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

records_basis2026-09-25

empty to hhsby backfillSource

records2026-09-25

empty to 869by backfillSource

summary2026-09-25

empty to Cognizant TriZetto Software Group, Inc., a business associate (BA) of Western Health Advantage, experienced a communication error while performing routine maintenance on its servers which allowed another covered entity to inadvertently downby 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.

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