Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Sean William Marquis, MD

Individual provider Emergency Medicine Physician · NPI 1053554089

Sean William Marquis, MD is an Emergency Medicine in Janesville, Wisconsin. Qualified in 2009, 17 years ago. Practices with Mercy Health System Corporation, a 751-clinician group and accepts Medicare assignment. Licensed in Illinois, Michigan, Ohio and Wisconsin.

Years since qualifying
17
Licensed in
IL, MI, OH, WI
In the registry since
2009
Specialties on file
4
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1000 Mineral Point Ave
Janesville, WI 53548-2940
Phone: (608) 756-6611
Fax: (608) 756-6177
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 46924-20 (WI)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 4301099517 (MI)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 036132727 (IL)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 35097788 (OH)

Record details

NPI number1053554089
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 7, 2009
Last updated in NPPESApril 16, 2026
Certification dateApril 16, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Mercy Health System Corporation — 751 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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