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

Stephen O'Brien, MD

Individual provider Internal Medicine Physician · NPI 1699794453

Stephen O'Brien, MD is an Internal Medicine Physician in Oakland, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
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

3100 Summitt Street 2nd Fl
Oakland, CA 94609-0000
Phone: (510) 869-8400
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G74654 (CA)

Record details

NPI number1699794453
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 19, 2006
Last updated in NPPESJuly 8, 2007

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