Michael Warren Guiou, M.D.
Radiation Oncology Physician · Green Bay, WI
Michael Warren Guiou, M.D. is a radiation oncology physician with a practice address in Green Bay, Wisconsin, and NPI 1548436363, issued on May 1, 2008. Check the license on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Michael Warren Guiou
- Credential
- M.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 35122030 OH
Self-reported in NPPES; status is on the state search - Practice location
- 1726 Shawano Ave, Green Bay, WI 54303
- Phone
- (920) 884-3135
- Enumerated
- May 1, 2008
- Record last updated
- Dec 16, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20160330002501); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2008
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 153 in Wisconsin → Look up another NPI →
Also registered at 1726 Shawano Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Joao Vitor Andreoli Saltao, MDInternal Medicine Physician1851870976
- Mohamed Azab, M.DGastroenterology Physician1013390434
- Melissa Bader, NPFamily Nurse Practitioner1508692724
- Yaw Berko, MDInternal Medicine Physician1003952995
- Jules Blank, M.D.Hematology & Oncology Physician1730273889
Verify Michael Warren Guiou in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining BoardCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average radiation oncology physician in 2024
60 Medicare Part D claims for 35 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Tamsulosin Hcl27 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Dlp Marquette Physician Practices IncMarquette, MI
- St Vincent Hospital-Hospital Sisters-Third Order OF St FrancisGreen Bay, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Michael Warren Guiou among 153 radiation oncology physician records in Wisconsin
Michael Warren Guiou, M.D. is one of 153 radiation oncology physician records with a practice address in Wisconsin. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 50% of them.
- NPI issued2008 · 50% of these records are older, 43% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated2008 · median 2008 among the 119 with a school on file
- Record last updated2021 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Wisconsin
There are 153 radiation oncology physician records in Wisconsin.
All 153 in Wisconsin → Every provider in Green Bay → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Alex Coffman, MDGreen Bay, WI 543031871045690
- Linda Gemer, MDGreen Bay, WI 543041558318782
- Sally Schlise, MDGreen Bay, WI 543011023059268
- Daniel Hong, MDGreen Bay, WI 543111124605548
- David Rohde, MDGreen Bay, WI 543111649213588
- Pamela Vanderwall, MDGreen Bay, WI 543111225075609
- Adam Liss, MDGreen Bay, WI 543131700101250
- Darryl BartonWausau, WI 544011609822774
Common questions
What is Michael Warren Guiou, M.D.'s NPI number?
Michael Warren Guiou, M.D.'s National Provider Identifier (NPI) is 1548436363, issued on May 1, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Michael Warren Guiou, M.D. located?
The NPPES record lists a practice address at 1726 Shawano Ave, Green Bay, WI, 54303. Phone: (920) 884-3135. Providers update this record themselves, so call before visiting.
How can I verify Michael Warren Guiou, M.D.'s license?
Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael Warren Guiou, M.D. prescribe under Medicare Part D?
In 2024, Michael Warren Guiou, M.D. had 60 Medicare Part D claims for 35 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.