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

James Donald Williamson

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1174934012

James Donald Williamson is an Addiction (Substance Use Disorder) Counselor in South San Francisco, California. Practices as a sole proprietor. Registered with an NPI since 2014.

In the registry since
2014

Practice location Address checks out

301 Grand Ave Ste 301
South San Francisco, CA 94080-3641
Phone: (650) 244-1447
Fax: (650) 244-1447
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X

Record details

NPI number1174934012
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorYes
NPI enumeratedMay 14, 2014
Last updated in NPPESMay 14, 2014

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