Tandem Diabetes Care
Disclosed Mar 17, 20206 years ago140,838 affectedConfirmed
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 affected | 140,838 (as reported by the organization) |
|---|---|
| Disclosed | Mar 17, 2020 |
| Discovered | Jan 17, 2020 |
| Happened | Jan 17, 2020 |
| Attack | Hacking |
| Data exposed | Names, Social Security numbers, Health |
| Sector | Healthcare · US |
| Status | Confirmed |
Sources
| Source | |
|---|---|
| California Attorney General breach notice: Tandem Diabetes Careoag.ca.gov · Official notice | Official notice |
| Oregon DOJ breach notice: Tandem Diabetes Carejustice.oregon.gov · Official notice | Official notice |
| Maine Attorney General breach notice archive: Tandem Diabetes Caremaine.gov · Official notice | Official notice |
| HHS OCR breach report (archive, resolved): Tandem Diabetes Care (Healthcare Provider, CA)ocrportal.hhs.gov · Official notice | Official notice |
Notices filed
| Where | Filed | People |
|---|---|---|
| California AGresidents of CA | Mar 17, 2020 | |
| Oregon DOJresidents of OR | Mar 17, 2020 | 140,838 |
| Maine AGresidents of ME | Mar 17, 2020 | 15 |
| HHS archivetotal | Mar 17, 2020 | 140,781 |
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.