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Brian J Holoyda, MD, MPH, MBA

Psychiatry Physician in Martinez, CA · enumerated 2012.

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

National Provider Identifier

1144588989

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Registry record

Entity type Individual (Type 1)
Name Brian J Holoyda
Credential MD, MPH, MBA
Sex Male
Practice address 1000 Ward St, Martinez, CA, 94553
Phone (925) 335-4600
Enumeration date Apr 30, 2012
Last updated in NPPES Apr 12, 2025

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 2017017688 (MO) Secondary
2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License A126944 (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.

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Frequently asked questions

Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Brian Holoyda?
Brian Holoyda is registered in NPPES with the primary taxonomy of Psychiatry Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-12.