npidata.org Sign in
Products
Provider RadarWatch an area and specialty — weekly alerts on new cliniciansPractice RadarWeekly alerts when new organisations register nearbySpecialtiesEvery NUCC taxonomy, with counts by state and cityStatesProvider counts and breakdowns for all 50 statesPhysician listsMDs and DOs with addresses and phone numbersNP listsNurse practitioners, the fastest-growing groupAPIJSON, delta feed, free tier
Use cases
Healthcare sales prospectingPhysician recruiting and locum staffingMedical device sales territory planningCredentialing and provider verificationHealthcare marketing lists and audience buildingPharmaceutical sales and prescriber targeting
Account
Start freeThree radars and an export a month Sign in Pricing
Explore
Data Labs API
About
About usTermsPrivacyContact us

Search › California › Psychiatry Physician

Brian Holoyda, MD, MPH, MBA

NPI 1144588989 · on the registry since 2012

Practice

Address
1000 Ward St
Martinez, CA 94553
Phone
(925) 335-4600
Organisation at this address
Contra Costa County
Contra Costa County
Contra Costa County
Martinez Detention Facility Pharmacy
Inferred from a shared address, not stated in the registry.
Clinicians at this address
23

Registry record

Primary taxonomy
Psychiatry Physician
2084P0800X
Also registered as
Psychiatry Physician
Licence states on file
MO, CA
From the registry's licence fields, which are often incomplete.
Sex
Male
Record last updated
2025-04-12

Source: CMS National Plan and Provider Enumeration System. Registration is not the same as practising, and the registry records no retirement — some people listed here no longer practise. More in California