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

Brian J Kosiak, MD

Individual provider Internal Medicine Physician · NPI 1336150259

Brian J Kosiak, MD is an Internal Medicine Physician in Eau Claire, Wisconsin. Licensed in Colorado, Minnesota and Wisconsin. Registered with an NPI since 2006.

Licensed in
CO, MN, 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

2809 E Hamilton Ave # 107
Eau Claire, WI 54701-6863
Phone: (715) 834-1555
Fax: (715) 835-2063
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 36333 (MN)
Internal Medicine Physician Taxonomy 207R00000X · Licence 46560-20 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 27582 (CO)

Record details

NPI number1336150259
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 10, 2006
Last updated in NPPESMarch 8, 2011

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