Massachusetts · State rollup
Healthcare data breaches in Massachusetts, 2026.
18 HHS OCR-reported healthcare data breaches affecting 946,850 Massachusetts 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
Vendor breach Access Information Management Shared Services, LLC 1,522 Ransomware High Point Treatment Center, Inc. 25,832 Hacking Middlesex Sheriff's Office 501 Unauthorized access Andover Eye Associates 1,638 Hacking Heywood Healthcare Inc. including Henry Heywood Memorial Hospital, Athol Memorial Hospital, and Heywood Medical Group, Inc. (“Heywood”) 500 Ransomware Dermatology Associates of Concord 501 Hacking North Atlantic States Carpenters Health Benefits Fund 501 Hacking Teamsters Union 25 Health Services & Insurance Plan 19,231 Unauthorized access Zelis Healthcare LLC 4,289 Insider threat Berkshire Health Systems, Inc. 1,421 Hacking The Brien Center for Mental Health and Substance Abuse Services 5,427 Ransomware Covenant Health 478,188 Hacking Picis Clinical Solutions, Inc. d/b/a Medstreaming 8,840 Hacking Sensata Technologies, Inc. Health and Welfare Benefit Plan 15,630 Hacking Next Step Healthcare LLC 12,090 Unauthorized access Insulet Corporation 841 Phishing Onsite Mammography 357,265 Unauthorized access Mental Health Association Inc. 12,633