Wisconsin · State rollup
Healthcare data breaches in Wisconsin, 2026.
11 HHS OCR-reported healthcare data breaches affecting 345,417 Wisconsin residents. 4 attributed to ransomware groups. Each entry below names the provider, the data exposed, and the steps to take if you received a notification letter.
Date Type Organization Affected
Phishing Delta Medical Systems, Inc. 1,574 Ransomware Morton Drug Company 40,051 Phishing Marshfield Clinic Health System 35,952 Ransomware Assisted Living Pharmacy Service, LLC 5,590 Hacking zizzl llc 2,416 Hacking City of Franklin 3,233 Hacking Clement Manor 16,046 Unauthorized access 90 Degree Benefits, Inc. – St. Paul 1,268 Ransomware Bell Ambulance, Inc. 237,830 Ransomware ARC Community Services, Inc. 501 Hacking Samaritan Counseling Center of the Fox Valley 956