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

Walter C. Prehn MD a Professional Corporation

Organization Internal Medicine Physician · NPI 1306143169

Walter C. Prehn MD a Professional Corporation is an Internal Medicine Physician in Sonoma, California. Licensed in California. Registered with an NPI since 2011.

Licensed in
CA
In the registry since
2011

Practice location Address checks out

181 Andrieux St Ste 206
Sonoma, CA 95476-6920
Phone: (707) 495-7762
Fax: (707) 938-7337
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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 G25454 (CA)

Record details

NPI number1306143169
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Walter Prehn — President · (707) 495-7762
NPI enumeratedFebruary 14, 2011
Last updated in NPPESOctober 5, 2012
Mailing address181 Andrieux St, Suite 206, Sonoma, CA 95476-6920

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