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

Individual provider Internal Medicine Physician · NPI 1366542227

Douglas P Duffy, MD is an Internal Medicine Physician in Marshfield, Wisconsin. Works from 2 locations. Licensed in North Dakota and Wisconsin.

Licensed in
ND, WI
In the registry since
2006
Specialties on file
3
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 N Oak Ave
Marshfield, WI 54449
Phone: (715) 387-5345
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 801 Broadway N, Fargo, ND 58102-3641 — (701) 234-2000

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence 25241 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 25241 (WI)
Nephrology Physician Taxonomy 207RN0300X · Licence LT15265 (ND)

Record details

NPI number1366542227
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 22, 2006
Last updated in NPPESAugust 1, 2018
Mailing address1000 N Oak Ave, Marshfield, WI 54449-5777

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