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47 disclosed this week · 26,367 on record

Tandem Diabetes Care

Disclosed Mar 17, 2020140,838 affectedConfirmed

Official notice

The covered entity (CE), Tandem Diabetes Care, Inc., reported that it was the victim of a cyber-attack involving the electronic protected health information (ePHI) of 140,781 individuals. The ePHI involved included names, dates of birth, addresses, Social Security numbers, diagnoses, medications prescribed, and other treatment information. The CE notified HHS, affected individuals, the media, and provided substitute notice on its website. The CE also provided complimentary identity and credit monitoring services to all affected individuals. In response to the breach, the CE revised its HIPAA security procedures, and implemented additional technical safeguards. OCR provided technical assistance to the CE and obtained assurances that the CE implemented the corrective actions noted.

What is known

People affected140,838 (as reported by the organization)
DisclosedMar 17, 2020
DiscoveredJan 17, 2020
HappenedJan 17, 2020
AttackHacking
Data exposedNamesSocial Security numbersHealth
SectorHealthcare · US
StatusConfirmed

Sources

Notices filed

History of this record
attack2026-09-25
unknown to hackingby backfillSource
data_types2026-09-25
["names","ssn"] to ["names","ssn","health"]by backfillSource
summary2026-09-25
empty to The covered entity (CE), Tandem Diabetes Care, Inc., reported that it was the victim of a cyber-attack involving the electronic protected health information (ePHI) of 140,781 individuals. The ePHI involved included names, dates of birth, adby backfillSource
data_types2026-09-25
[] to ["names","ssn"]by backfillSource
records_basis2026-09-25
empty to organizationby backfillSource
records2026-09-25
empty to 140838by backfillSource
discovered2026-09-25
empty to 2020-01-17by 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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