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Marshfield Clinic Data Breach Investigation
Shamis & Gentile P.A., one of the nation's premier class action law firms specializing in data breach cases, is investigating the Marshfield Clinic Health System data breach.
If you were affected by the data breach, your sensitive personally identifiable information may have been exposed, and you may be eligible for compensation.
About Marshfield Clinic Health System
Marshfield Clinic Health System is a large nonprofit integrated health care provider serving rural communities across northern, central, and western Wisconsin, as well as Michigan's Upper Peninsula. Since its founding in 1916, Marshfield Clinic Health System has grown to include more than 65 clinical locations, 11 hospitals, and a workforce of over 12,000 employees, including more than 1,600 medical providers.
The health system offers a wide range of medical services, from primary care to specialized treatments in over 170 specialties and subspecialties. It also operates a research institute, a health plan called Security Health Plan, and supports education and training for medical students and residents.
What happened?
On Nov. 7, 2025, Marshfield Clinic Health System disclosed a data breach to the U.S. Department of Health and Human Services. According to the official report, the breach affected 35,952 individuals in the United States.
While the specific types of information exposed in this incident have not been detailed in the public disclosure, data breaches at health care organizations often involve sensitive personal and health-related information. It is important for anyone who may have been affected to stay alert for further notifications from Marshfield Clinic Health System regarding the types of data involved.
Possible Information Exposed
- Name
- Address
- Phone number
- date of birth
- Medical information
- Health insurance information
If you were a patient, employee, or otherwise connected to Marshfield Clinic Health System, it is possible that your information was compromised in this incident.
Your Rights and Next Steps
If your information was exposed in the Marshfield Clinic Health System data breach, you have important rights under state and federal law.
Potential Next Steps
- Communication and credit monitoring services: Review and save any notification letters you receive. Enroll in free credit monitoring and identity protection services, if offered.
- Monitor your accounts carefully: Check your financial statements regularly for suspicious activity or unauthorized transactions. If you notice anything unusual, contact your financial institution immediately.
- Fraud alert and credit reports: A fraud alert informs creditors to take extra steps to verify your identity before opening new accounts in your name. Consumers are also entitled to one free credit report annually from each credit bureau. You can request a fraud alert or a credit report by contacting any one of the three major credit bureaus.
- Seek legal help: Lawyers are ready to help you understand your rights and pursue compensation.
You May Be Entitled to Compensation
If you were affected by the Marshfield Clinic Health System data breach, you may be eligible for compensation. Lawyers are investigating this incident and are available to help you understand your options. To find out if you qualify to join a lawsuit or to get more information, complete the below form.
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