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

Individual provider Internal Medicine Physician · NPI 1639335235

Ioannis Karkatzounis, MD is a Hospitalist in Oshkosh, Wisconsin. Qualified in 1999, 27 years ago. Practices with Cep America-Illinois Hospitalists, LLP, a 196-clinician group and accepts Medicare assignment. Licensed in Illinois and Wisconsin.

Years since qualifying
27
Licensed in
IL, WI
In the registry since
2008
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

855 N Westhaven Dr
Oshkosh, WI 54904-7668
Phone: (920) 303-8700
Fax: (920) 456-7601
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 036-120385 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 2960 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036120385 (IL)
Hospitalist Physician Taxonomy 208M00000X · Licence 2960 (WI)

Record details

NPI number1639335235
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedAugust 3, 2008
Last updated in NPPESSeptember 26, 2024
Certification dateSeptember 26, 2024

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Also practisesGERIATRIC MEDICINE, INTERNAL MEDICINE, SLEEP MEDICINE
Medical schoolOTHER
Graduated 1999 (27 years in practice)
Group practice Cep America-Illinois Hospitalists, Llp — 196 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations12 on file with Medicare

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