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

Dr. Thomas Keith Duncan, MD

Individual provider Internal Medicine Physician · NPI 1588641039

Dr. Thomas Keith Duncan, MD is an Internal Medicine in Neenah, Wisconsin. Graduated from Northwestern University Feinberg Medical School in 1975, 51 years ago. Practices with Thedacare, Incorporated, a 654-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Wisconsin.

Years since qualifying
51
Trained at
Northwestern University Feinberg Medical School
Licensed in
WI
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

200 Theda Clark Medical Plz Ste 240
Neenah, WI 54956-2790
Phone: (920) 725-2070
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 22196 (WI)

Record details

NPI number1588641039
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 27, 2005
Last updated in NPPESNovember 23, 2011
Mailing addressPo Box 8003, Appleton, WI 54912-8003

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1975 (51 years in practice)
Group practice Thedacare, Incorporated — 654 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations9 on file with Medicare

Other providers in Neenah