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

Individual provider Internal Medicine Physician · NPI 1689638959

Dr. Nathan M Bass, MD is an Internal Medicine Physician in San Francisco, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
Specialties on file
2
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

350 Parnassus Ave #410
San Francisco, CA 94143-0001
Phone: (415) 353-2318
Fax: (415) 353-2407
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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 A39874 (CA)
Gastroenterology Physician Taxonomy 207RG0100X · Licence A39874 (CA)

Record details

NPI number1689638959
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 13, 2006
Last updated in NPPESJuly 23, 2008

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