WI · HHS OCR reports
HIPAA breaches in Wisconsin
HIPAA breaches affecting 500 or more individuals reported to HHS OCR by covered entities listed in Wisconsin.
Reports
126
Individuals affected
12,717,130
Under investigation
12
Top type: Hacking/IT Incident
State breach notification law
Wis. Stat. § 134.98 (Trade Regulations - Notice of Unauthorized Acquisition of Personal Information) (amended 2007)
Timing: 45 days Wisconsin requires entities (including businesses) to notify affected individuals within a
Read the Wisconsin data breach notification law summaryAll reports, newest first
Page 3 of 3. 126 reports.
| Covered entity | Entity type | Individuals | Submitted | Type of breach | Status |
|---|---|---|---|---|---|
| The Medical College of Wisconsin, Inc. | Healthcare Provider | 9,500 | Nov 17, 2017 | Hacking/IT Incident | Archive (closed) |
| Briggs & Stratton Corporation | Health Plan | 12,789 | Sep 29, 2017 | Hacking/IT Incident | Archive (closed) |
| Network Health | Health Plan | 51,232 | Sep 8, 2017 | Hacking/IT Incident | Archive (closed) |
| University of Wisconsin - Madison | Healthcare Provider | 1,000 | Sep 7, 2017 | Unauthorized Access/Disclosure | Archive (closed) |
| Community Link Inc | Health Plan | 5,524 | Jun 30, 2017 | Hacking/IT Incident | Archive (closed) |
| UW Health | Healthcare Provider | 2,036 | May 25, 2017 | Hacking/IT Incident | Archive (closed) |
| Orthodontic Specialists of Green Bay | Healthcare Provider | 742 | Apr 24, 2017 | Hacking/IT Incident | Archive (closed) |
| Metropolitan Urology Group | Business Associate | 17,634 | Mar 10, 2017 | Hacking/IT Incident | Archive (closed) |
| SSM Dean Medical Group | Healthcare Provider | 4,800 | Jan 10, 2017 | Unauthorized Access/Disclosure | Archive (closed) |
| University of Wisconsin Hospitals and Clinics Authority | Healthcare Provider | 6,923 | Sep 30, 2016 | Unauthorized Access/Disclosure | Archive (closed) |
| Medical College of Wisconsin | Healthcare Provider | 3,179 | Sep 2, 2016 | Hacking/IT Incident | Archive (closed) |
| Quarles & Brady, LLP | Business Associate | 1,032 | Apr 19, 2016 | Theft | Archive (closed) |
| Oneida Tribe of Indians of Wisconsin | Healthcare Provider | 2,734 | Apr 15, 2016 | Theft | Archive (closed) |
| Aurora Health Care, Inc. | Healthcare Provider | 869 | Apr 1, 2016 | Unauthorized Access/Disclosure | Archive (closed) |
| ST Psychotherapy, LLC | Healthcare Provider | 509 | Dec 23, 2015 | Theft | Archive (closed) |
| Dean Health Plan | Health Plan | 960 | Nov 11, 2015 | Loss | Archive (closed) |
| University of Wisconsin-Madison School of Pharmacy | Business Associate | 41,437 | Jan 30, 2014 | Loss | Archive (closed) |
| United Dynacare, LLC dba Dynacare Laboratories | Healthcare Provider | 9,328 | Nov 18, 2013 | Theft | Archive (closed) |
| SSM Health Care of Wisconsin DBA: St. Mary���s Janesville Hospital | Healthcare Provider | 631 | Oct 25, 2013 | Theft | Archive (closed) |
| Froedtert Health | Healthcare Provider | 43,549 | Feb 12, 2013 | Hacking/IT Incident | Archive (closed) |
| Western Wisconsin Medical Association, S.C. - River Falls Medical Clinics | Healthcare Provider | 2,400 | Jan 25, 2013 | Theft | Archive (closed) |
| Lakeview Medical Center | Healthcare Provider | 698 | Feb 14, 2012 | Theft | Archive (closed) |
| Living Healthy Community Clinic | Business Associate | 3,000 | Sep 13, 2011 | Hacking/IT Incident | Archive (closed) |
| Dean Health Systems, Inc.; St. Mary's Hospital; St. Marys Dean Ventures, Incorporated | Healthcare Provider | 3,288 | Dec 20, 2010 | Theft | Archive (closed) |
| Tomah Memorial Hospital | Healthcare Provider | 600 | Apr 16, 2010 | Other | Archive (closed) |
| Thrivent Financial for Lutherans | Health Plan | 9,500 | Mar 3, 2010 | Theft | Archive (closed) |
Source: HHS OCR Breach Portal, OCR export October 2026.