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

Dr. Brian James O'Neill, MD

Individual provider Internal Medicine Physician · NPI 1366425985

Dr. Brian James O'Neill, MD is an Internal Medicine Physician in Martinez, California. Licensed in California. Registered with an NPI since 2005.

Licensed in
CA
In the registry since
2005
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

150 Muir Rd
Martinez, CA 94553-4668
Phone: (925) 372-2018
Fax: (925) 372-2020
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 G42079 (CA)

Record details

NPI number1366425985
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 29, 2005
Last updated in NPPESJuly 13, 2026

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