Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

James Robert O'Brien, MD

Emergency Medicine Physician in South San Francisco, CA · enumerated 2019.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1780143024

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Registry record

Entity type Individual (Type 1)

Name James Robert O'Brien

Credential MD

Sex Male

Practice address 1200 El Camino Real, South San Francisco, CA, 94080

Phone (650) 742-2000

Enumeration date Mar 17, 2019

Last updated in NPPES Sep 9, 2024

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 125.073615 (IL) Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 036164831 (IL) Secondary

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License A195340 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for James O'Brien?

The National Provider Identifier (NPI) for James O'Brien is 1780143024, a Type 1 (individual) record in the CMS NPPES registry.

Where does James O'Brien practice?

The practice location on file with NPPES is in South San Francisco, CA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-09-09.