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

Individual provider Internal Medicine Physician · NPI 1265596191

Thomas C Guyn, MD is an Internal Medicine Physician in Santa Rosa, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
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

3536 Mendocino Ave Ste 300
Santa Rosa, CA 95403-3634
Phone: (707) 546-2180
Fax: (707) 546-2188
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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 A42640 (CA)

Record details

NPI number1265596191
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 22, 2006
Last updated in NPPESAugust 11, 2014

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