Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Michael Warren Guiou, MD

Individual provider Radiation Oncology Physician · NPI 1548436363

Michael Warren Guiou, MD practises Radiation Oncology in Green Bay, Wisconsin. Graduated from University of California, Davis School of Medicine in 2008, 18 years ago. Practices with St Vincent Hospital-Hospital Sisters-Third Order of St Francis, a 594-clinician group and accepts Medicare assignment. Licensed in Ohio.

Years since qualifying
18
Trained at
University of California, Davis School of Medicine
Licensed in
OH
In the registry since
2008
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

1726 Shawano Ave
Green Bay, WI 54303-3216
Phone: (920) 884-3135
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Radiation Oncology Physician (primary) Taxonomy 2085R0001X · Licence 35122030 (OH)

Record details

NPI number1548436363
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 1, 2008
Last updated in NPPESDecember 16, 2021
Certification dateDecember 16, 2021

Medicare enrollment

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

Medicare specialtyRADIATION ONCOLOGY
Medical schoolUNIVERSITY OF CALIFORNIA, DAVIS SCHOOL OF MEDICINE
Graduated 2008 (18 years in practice)
Group practice St Vincent Hospital-Hospital Sisters-Third Order Of St Francis — 594 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients123
Services billed 1,048 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Uphs Marquette Dlp Hospital Hospital · Marquette, MI · listed as Dlp Marquette General Hospital LLC
  • Door County Medical Center Hospital · Sturgeon Bay, WI
  • St Vincent Hospital Hospital · Green Bay, WI

Colleagues at St Vincent Hospital-Hospital Sisters-Third Order of St Francis

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 594 clinicians in the practice; 12 are shown here.

Other providers in Green Bay