Largest HIPAA breach reports, last 12 months (individuals affected)Largest HIPAA breach reports, last 12 months (individuals affected)DentaQuest, LLC: 15,000,000DentaQuest, LLC15,000,000Aesto, LLC: 9,540,683Aesto, LLC9,540,683iRhythm Technologies, Inc.: 8,179,772iRhythm Technologies, Inc.8,179,772AdaptHealth, LLC: 4,115,802AdaptHealth, LLC4,115,802Unlimited Technology Systems, LLC: 3,803,750Unlimited Technology Systems, LLC3,803,750CareCloud, Inc.: 3,756,469CareCloud, Inc.3,756,469TriZetto Provider Solutions: 3,433,965TriZetto Provider Solutions3,433,965QualDerm Partners, LLC: 2,951,318QualDerm Partners, LLC2,951,318Nacogdoches Memorial Hospital n: 2,507,073Nacogdoches Memorial Hospital n2,507,073Navia Benefit Solutions, Inc. : 2,151,330Navia Benefit Solutions, Inc. 2,151,330Source: Zalwin, Data breach notice statistics (data as of 2026-11-05) ยท zalwin.com/studies/data-breach-notice-statsFull study and data: Zalwin Data breach notice statistics