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

Dr. Michael Terrence O'Brien, MD

Individual provider Family Medicine Physician · NPI 1821181215

Dr. Michael Terrence O'Brien, MD is a Family Medicine Physician in Castro Valley, California. Practices as a sole proprietor. Licensed in California.

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

20100 Lake Chabot Rd
Castro Valley, CA 94546-5306
Phone: (510) 581-7677
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G61152 (CA)

Record details

NPI number1821181215
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedSeptember 30, 2006
Last updated in NPPESAugust 21, 2007
Mailing address20100 Lake Chabot Rd, Castro Valley, CA 94546-5306

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