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info icon Marshfield Clinic Health System has been informed by Welltok, Inc., a vendor that provides mailing services, that Welltok experienced a security incident that impacted some of our patients' personal information. Welltok will be reaching out to patients affected. Welltok is communicating directly with patients by letter about the situation and next steps. The letter from Welltok is not a scam. This incident did not impact systems at Marshfield Clinic. If you have questions, visit for more information about the incident to view this notice.

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Marshfield Clinic Health System (MCHS) has enriched lives for 100 years. Initiatives for the future are rooted in this century-strong legacy of caring for our patients and community.

We are committed to being a regional destination for world-class care and a major job-creator for the local economy.

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COVID-19, Flu, ​RSV Resources​​

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The Marshfield Clinic system is focused on patient care, research and education as expressed by its diverse parts where our mission is put into action.