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

Dr. William J Hopper, MD

Individual provider Occupational Medicine Physician · NPI 1447439765

Dr. William J Hopper, MD is an Occupational Medicine Physician in Oakland, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

384 Embarcadero W 3rd Fl
Oakland, CA 94607-3731 Not confirmed with CMS for 18 years — call before visiting
Phone: (510) 465-9810
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Occupational Medicine Physician (primary) Taxonomy 2083X0100X · Licence 20701 (CA)

Record details

NPI number1447439765
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedNovember 2, 2007
Last updated in NPPESNovember 2, 2007

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