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Edit this profileAt a glance
- 3100 Summitt Street, 2Nd Floor, Oakland, CA 94609
About Dr. O'brien
Stephen O'Brien, M.D. practices internal medicine in Oakland, CA. The provider's National Provider Identifier (NPI) is 1699794453.
Factual summary compiled by Guide.md from public records; not written by this provider.
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (510) 869-8400
- Email not available
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Practice Locations
3100 SUMMITT STREET 2ND FLOOR
Oakland, CA 94609
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Common questions
What is Stephen O'Brien's specialty?
Stephen O'Brien is an internist in Oakland, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where can I find Stephen O'Brien?
Stephen O'Brien is listed at 3100 Summitt Street 2Nd Floor, Oakland, CA 94609. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Stephen O'Brien?
The number on file is (510) 869-8400. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Stephen O'Brien?
Stephen O'Brien's National Provider Identifier is 1699794453. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
How much experience does Stephen O'Brien have?
Stephen O'Brien has 20+ years experience. Registered with an NPI since 2006. National Provider Identifiers only began in 2005, so a provider who qualified earlier may have practiced for longer than this.
NPI registry
Is Stephen O'Brien's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Stephen O'Brien. If this is you, claiming it is free.
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