McLaren Health Care
Data Breach Class Action Lawsuit

Posted: June 20, 2025 -- Attention, victims of the McLaren Health Care data breach.

Abington Cole + Ellery is investigating the data breach recently announced by McLaren Health Care.

McLaren Health Care Data Breach Summary:

Approximately 743,000 individuals were affected by the McLaren Health Care data breach, and breached data may include, but is not necessarily limited to: names, Social Security numbers, driver’s license numbers, medical data, and health insurance data.

On or around August 5, 2024, McLaren Health Care detected unusual activity affecting certain McLaren Health Care and Karmanos Cancer Institute computer systems. In response, the organization says it activated its emergency protocols and brought in external cybersecurity experts to investigate the issue, assess the situation, and protect its network infrastructure.

The investigation purportedly revealed that unauthorized access had occurred over a span of several weeks, beginning on July 17, 2024, and ending on August 3, 2024. In the aftermath, McLaren Health Care published public updates on both the mclaren.org and karmanos.org websites and opened a call center to address concerns from patients and community members.

As the examination continued, McLaren Health Care says it conducted a detailed forensic review of the compromised files to determine whether they contained any sensitive data. This analysis reportedly concluded on May 5, 2025. At that point, it was apparently confirmed that the files included personal and protected health information belonging to individuals connected with the organization.

As a result of the data breach, McLaren Health Care is offering 12 months of free credit monitoring and/or identity theft protection services to some affected individuals.

Additional information about the McLaren Health Care data breach may be found here: McLaren Health Care Data Breach Notification (Maine). The McLaren Health Care Website may also have additional information about or provide periodic updates regarding the data breach.

About McLaren Health Care:

McLaren Health Care is a Michigan-based, nonprofit health system that operates a network of hospitals, outpatient facilities, and medical services across the state. The system includes academic medical centers, community hospitals, and specialized care units. McLaren collaborates with research institutions and higher education entities to integrate clinical practice with medical education and research initiatives. The organization also maintains affiliations with physicians and care providers across multiple disciplines.

The health system’s operations span a broad range of healthcare services, including primary care, emergency services, cancer treatment, behavioral health, and rehabilitation. McLaren Health Plan, a subsidiary of the system, provides managed care services to individuals across commercial, Medicaid, and Medicare programs. The organization supports graduate medical education programs and clinical trials through designated facilities, and it participates in partnerships aimed at improving health outcomes and operational efficiency.

McLaren Health Care's administrative headquarters are located in Grand Blanc, Michigan. The organization maintains oversight over numerous entities, including its medical group, pharmacy services, home health care, and imaging services. It manages compliance and performance through centralized governance and standardized protocols, while supporting system-wide integration of health information technology. The health system continues to expand through acquisitions and regional partnerships that align with its organizational structure and care delivery framework.

For more information about steps you can take to possibly reduce the chances harm arising from a data breach, please review the following article: What are some steps you can take if you've been the victim of a data breach?

If you believe you are a victim of the McLaren Health Care data breach, and if you would like to volunteer to serve as a class representative in a class action lawsuit regarding this data breach, please submit your information via the form on this webpage. This website is not associated with nor authorized by McLaren Health Care or any affiliated companies. If you have received any other data breach notifications, you may to review Abington Cole + Ellery's current list of data breach investigations.