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Tandem Diabetes Care

Disclosed Mar 17, 20206 years ago140,838 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 exposedNames, Social Security numbers, Health
SectorHealthcare · US
StatusConfirmed

Sources

Source
California Attorney General breach notice: Tandem Diabetes Careoag.ca.gov · Official notice
Oregon DOJ breach notice: Tandem Diabetes Carejustice.oregon.gov · Official notice
Maine Attorney General breach notice archive: Tandem Diabetes Caremaine.gov · Official notice
HHS OCR breach report (archive, resolved): Tandem Diabetes Care (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice

Notices filed

WhereFiledPeople
California AGresidents of CAMar 17, 2020
Oregon DOJresidents of ORMar 17, 2020140,838
Maine AGresidents of MEMar 17, 202015
HHS archivetotalMar 17, 2020140,781
History of this record
  • 2026-09-25 · attack: unknown to hacking · backfill source
  • 2026-09-25 · data_types: ["names","ssn"] to ["names","ssn","health"] · backfill source
  • 2026-09-25 · summary: 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, ad · backfill source
  • 2026-09-25 · data_types: [] to ["names","ssn"] · backfill source
  • 2026-09-25 · records_basis: empty to organization · backfill source
  • 2026-09-25 · records: empty to 140838 · backfill source
  • 2026-09-25 · discovered: empty to 2020-01-17 · backfill source
  • 2026-09-25 · added · backfill source

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

Everything about Tandem Diabetes Care

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