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

Thomas C Guyn MD Inc

Organization Internal Medicine Physician · NPI 1861766560

Thomas C Guyn MD Inc is an Internal Medicine Physician in Santa Rosa, California. Licensed in California. Registered with an NPI since 2012.

Licensed in
CA
In the registry since
2012
What do these letters mean?
Inc — Incorporated
A form of business registration, not a clinical qualification.

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Practice location Address checks out

1165 Montgomery Dr
Santa Rosa, CA 95405-4801
Phone: (707) 525-5300
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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 number1861766560
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Thomas Guyn — Physician · (952) 936-7736
NPI enumeratedFebruary 28, 2012
Last updated in NPPESFebruary 28, 2012
Mailing address122 Calistoga Rd # 329, Santa Rosa, CA 95409-3702

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