HHS OCR report · 2015
Siouxland Anesthesiology, Ltd. data breach
OCR report facts
- Covered entity
- Siouxland Anesthesiology, Ltd.
- Entity type
- Healthcare Provider
- State
- South Dakota
- Individuals affected
- 13,000
- Submission date
- Jul 31, 2015
- Type of breach
- Hacking/IT Incident
- Location of breached information
- Network Server
- Business associate present
- No
- Status
- Archive (closed)
OCR description
Siouxland Anesthesiology, the covered entity (CE), reported it was the subject of a criminal malware attack. The CE reported that hackers infiltrated one of its computer servers and installed malware that left patients’ electronic protected health information (ePHI) vulnerable to unauthorized access. The exposed ePHI included patients’ names, addresses, dates of birth, and, in some cases, Social Security numbers. The breach affected approximately 13,000 individuals. Following the breach r...
Text as published on the HHS OCR breach portal.
Frequently asked questions
How many people were affected by the Siouxland Anesthesiology, Ltd. data breach?
The report to HHS OCR lists 13,000 individuals affected.
When was it reported to HHS?
It was submitted to HHS OCR on Jul 31, 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 Siouxland Anesthesiology, Ltd. 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 Siouxland Anesthesiology, Ltd..