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DR. MICHAEL TERRENCE O'BRIEN M.D.
NPI 1821181215
Family Medicine in Castro Valley, CA

Active since September 30, 2006
20100 LAKE CHABOT RD, CASTRO VALLEY, CA 94546(510) 581-7677 Get Directions Write a Review

NPPES record last updated: August 21, 2007. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. Michael Terrence O'brien M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MICHAEL TERRENCE O'BRIEN M.D. (NPI 1821181215) is an individual family medicine provider in Castro Valley, California, licensed in California (G61152) and active in the NPI registry since September 2006.

NPPES Registry Identity

NPI1821181215
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. MICHAEL TERRENCE O'BRIENCredential: M.D.
Location Address20100 LAKE CHABOT RDCastro Valley, CA 94546-5306
Mailing Address20100 Lake Chabot RdCastro Valley, CA 94546-5306 · (510) 581-7677
Phone(510) 581-7677
Sole ProprietorYes
Enumeration DateSeptember 30, 2006
Last NPPES UpdateAugust 21, 2007
✔ NPI 1821181215 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in CA · G61152
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
20100 LAKE CHABOT RD, Castro Valley, CA 94546
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Other Providers at the Same Location NPPES 2

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

BAZ ALLERGY, ASTHMA & SINUS CENTER, INC.
Allergy & Immunology (Allergy)
20100 LAKE CHABOT RD, STE. 2
CASTRO VALLEY, CA 94546
Alameda County (510) 969-5418
CAROLYN MCALOON DPM PC
Podiatrist
20100 LAKE CHABOT RD, SUITE 2
CASTRO VALLEY, CA 94546
Alameda County (510) 581-1484

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Michael O'brien's NPI number?

The NPI number for Michael O'brien is 1821181215. It was assigned to this individual provider in the NPPES registry on September 30, 2006.

Where is Michael O'brien located?

Michael O'brien practices at 20100 Lake Chabot Rd, Castro Valley, CA 94546. The listed phone number is (510) 581-7677.

What is Michael O'brien's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

When was this NPI record last updated?

The NPPES record for Michael O'brien was last updated on August 21, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.