Individual provider · Type 1 NPI

Karthikeyan Viswanathan, DO

Internal Medicine Physician · Los Altos, CA

NPI number 1396128336 Active

Practice location

4546 El Camino Real Ste B7
Los Altos, CA 94022-1069

Call (866) 362-4246 Map

Fax (650) 260-6030

Specialties and licenses

TaxonomyCodeLicense
Internal Medicine Physician Primary 207R00000X20A19044 (CA)

Internal Medicine Physician: A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medi…

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About NPI 1396128336

Karthikeyan Viswanathan, DO's National Provider Identifier is 1396128336, issued on Jul 8, 2015. The primary taxonomy on file is Internal Medicine Physician (207R00000X), and the practice location is in Los Altos, CA. The record was last updated on Aug 21, 2025.