HHS OCR report · 2015
AT&T Group Health Plan data breach
OCR report facts
- Covered entity
- AT&T Group Health Plan
- Entity type
- Health Plan
- State
- Texas
- Individuals affected
- 50,000
- Submission date
- Mar 23, 2015
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
Health Care Service Corporation, a business associate (BA) of AT&T Group Health Plan, the covered entity (CE), stored the CE’s electronic protected health information (ePHI) on computer servers belonging to its parent corporation, Anthem, Inc. Anthem experienced a series of cyberattacks which exposed the electronic protected health information (ePHI) of almost 79 million people, affecting 50,000 individuals who received health insurance from the CE. The types of ePHI involved in the breach ...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the AT&T Group Health Plan data breach?
The report to HHS OCR lists 50,000 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Mar 23, 2015.
What type of breach was it?
The OCR portal lists the type of breach as Hacking/IT Incident, with the breached information located in: Network Server.
Is the investigation still open?
No. The report is in the OCR portal archive, which holds reports where OCR has closed its review.
Is a breach notice letter from AT&T Group Health Plan legitimate?
This site cannot verify letters. Check the sender against the organisation's official website and the HHS OCR breach portal, and avoid calling numbers or clicking links only listed in an unexpected message. See our guide on what to do after a data breach notice.
Source: HHS OCR Breach Portal, OCR export October 2026. Network USA is not affiliated with HHS or AT&T Group Health Plan.