Healthcare Data Breach Notifications Following Ransomware and EHR Vendor Compromise
MACT Health Board confirmed patient data theft tied to a November 2025 ransomware attack claimed by INC Ransom. The organization reported network access by an unauthorized party from Nov 12–20, 2025, followed by a file review completed Jan 9, 2026; exposed data may include patient names plus clinical information (e.g., diagnoses, test results, treatment details, medical images) and, for some individuals, Social Security numbers. MACT began mailing notification letters Jan 23, 2026 and is offering credit monitoring/identity theft protection where SSNs were involved.
Munson Healthcare separately notified more than 100,000 patients impacted by a Cerner (Oracle Health) compromise involving access to two legacy Cerner servers (unauthorized access beginning as early as Jan 22, 2025, detected Feb 20, 2025) containing data awaiting migration to the Oracle Cloud. Reported exposed data includes names, SSNs, and typical EHR content (medical record numbers, diagnoses, medications, test results, care details, and providers’ names); Cerner/Oracle Health engaged third-party incident response and notified law enforcement, and reporting indicates notification delays were influenced by law-enforcement requests and ongoing investigation, with litigation alleging the incident may have affected up to 80 hospitals.
Timeline
Jan 26, 2026
Michigan AG issues alert after Munson disclosure
Michigan Attorney General Dana Nessel issued a consumer alert in response to the Munson Healthcare breach disclosure. She also called for stronger state data-protection laws.
Jan 26, 2026
Munson Healthcare discloses 101,891 patients affected
Munson Healthcare notified patients that data in its electronic medical record system was exposed through the Cerner/Oracle Health cyberattack. The health system said 101,891 current and former patients were affected and offered two years of credit monitoring and identity theft protection.
Jan 23, 2026
MACT Health Board starts notifying affected patients
MACT Health Board began notifying affected individuals on January 23, 2026 about the November 2025 breach. It offered credit monitoring to people whose Social Security numbers were involved.
Nov 20, 2025
INC Ransom claims MACT Health Board attack
The INC Ransom ransomware group claimed responsibility for the MACT Health Board incident. The same group was also reported to have listed TriCity Family Services on its leak site and claimed to have stolen 22 GB of data there.
Nov 20, 2025
MACT Health Board intrusion ends after days of access
MACT Health Board determined the unauthorized access lasted until November 20, 2025. Exposed information included patient and clinical data, and for some individuals Social Security numbers.
Nov 12, 2025
MACT Health Board network intrusion begins
MACT Health Board said unauthorized access to its network started on November 12, 2025. The intrusion disrupted IT systems and was later tied to theft of patient information.
Oct 24, 2025
HAP phishing-related credential compromise occurs
Health Alliance Plan said employee credentials were compromised in a phishing incident on October 24, 2025. HAP later notified potentially affected members even though it could not confirm that their data was actually accessed.
May 14, 2025
TriCity Family Services intrusion ends
TriCity Family Services said the unauthorized access to its network continued until May 14, 2025. The organization later linked the incident to data theft and said the EMR environment was not compromised.
Mar 1, 2025
Oracle Health publicly confirms Cerner breach
Oracle Health publicly confirmed the Cerner cyberattack in March 2025. Later reporting indicated as many as 80 hospitals may have been affected.
Feb 20, 2025
Cerner detects cyberattack on legacy servers
Cerner detected the intrusion on February 20, 2025 and said a hacker had accessed two legacy servers. The incident ultimately affected multiple healthcare organizations and patient records.
Jan 22, 2025
Cerner servers first exposed in Oracle Health incident
In the Cerner/Oracle Health breach affecting healthcare providers including Munson Healthcare, unauthorized access may have begun as early as January 22, 2025 on two legacy Cerner servers awaiting migration to Oracle Cloud.
Nov 11, 2024
TriCity Family Services intrusion begins
TriCity Family Services said an unauthorized party gained access to its network beginning on November 11, 2024. The organization later determined files were copied during the intrusion, though its electronic medical record system was not accessed.
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Delayed patient notifications following healthcare data breaches at providers and vendors
Multiple healthcare organizations and vendors reported **delayed patient notifications** after discovering unauthorized access to protected health information (PHI), in some cases more than a year after the underlying compromise. In Colorado, **Alpine Ear, Nose, and Throat (Alpine ENT)** notified **65,648** individuals that an attacker accessed and exfiltrated files containing PHI in an incident identified on **Nov. 19, 2024**; the **BianLian** ransomware group later claimed responsibility and posted the organization to its leak site. Exposed data was described as highly sensitive, including medical information and, for some individuals, **financial account data and payment card details** (including CVC/expiration) and **Social Security numbers**; Alpine ENT reported no confirmed identity theft at the time of notification and offered credit monitoring. Separately, **Bayada Home Health Care** disclosed exposure risk tied to a **third-party vendor (Doctor Alliance)** after Doctor Alliance reported unauthorized network access during **Oct.–Nov. 2025**, potentially affecting Home Health Certification and Plan of Care forms containing patient identifiers and clinical/insurance details (and **SSNs for a subset**). Bayada said it discontinued using Doctor Alliance and reported the matter to regulators. In another vendor-related incident, **TriZetto Provider Solutions (Cognizant)**—an insurance verification provider—suffered a cyberattack impacting PHI across multiple states; Oregon providers began notifying additional patients after the breach was reported as occurring in **Nov. 2024** but not discovered until **Oct. 2, 2025**, with no financial data reportedly compromised and no evidence of misuse so far; the incident has prompted **class-action lawsuits**, engagement of **Mandiant**, and law enforcement notification.
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Healthcare Provider Data Breaches and Ransomware-Linked Patient Data Exposure
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Several healthcare-related organizations disclosed **separate data breach incidents** involving ransomware, unauthorized network access, and third-party compromise. CommonSpirit Health said patient data was exposed through a downstream vendor chain after **Pinnacle Holdings Ltd** suffered a ransomware attack, with attackers present in the network from November 11 to November 25, 2024, and exfiltrating files before the incident was later relayed through **NorthGauge Healthcare Advisors**. Meadowlark Hills and MedPeds also disclosed breaches tied to the **Beast ransomware** group, while Tieu Dental reported unauthorized access to its network in July 2025 that exposed patient information including Social Security numbers, medical and insurance data. These incidents led to regulatory notifications and offers of credit monitoring or identity theft protection for affected individuals. A separate legal development involved **Geisinger Health** and **Nuance Communications**, where a judge approved a **$5 million settlement** over claims tied to a former Nuance employee's theft of medical records affecting about 1.3 million patients. That matter differs from the ransomware and breach notifications because it concerns civil litigation over an earlier insider data theft rather than a newly disclosed intrusion. Overall, the reporting reflects ongoing exposure of protected health information across the healthcare sector through both direct attacks and third-party relationships, with delayed notification timelines and incomplete early visibility into the full scope of compromised data remaining recurring issues.
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