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

William Irving Johnson, MD

Individual provider Internal Medicine Physician · NPI 1285823427

William Irving Johnson, MD is an Internal Medicine Physician in Oakland, California. Licensed in California. Registered with an NPI since 2007.

Licensed in
CA
In the registry since
2007
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

5950 Harbord Dr
Oakland, CA 94611-3125
Phone: (510) 658-4425
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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 C36088 (CA)

Record details

NPI number1285823427
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 23, 2007
Last updated in NPPESMarch 3, 2016

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