Missouri · State rollup
Healthcare data breaches in Missouri, 2026.
10 HHS OCR-reported healthcare data breaches affecting 4.2M Missouri residents. 3 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
Hacking TriZetto Provider Solutions 3.4M Hacking Greater St. Louis Oral & Maxillofacial Surgery PC 501 Ransomware CareSTL Health, Inc. 501 Ransomware City of St. Joseph, MO Health Department 11,538 Hacking Esse Health 263,601 Hacking Missouri Department of Conservation 10,260 Vendor breach Ascension Health 437,329 Hacking Parc Provence Memory Care Facility 13,954 Ransomware The Gatesworth Senior Living St. Louis 31,124 Unauthorized access Cornerstones of Care 2,771