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

Mary P O'Brien, PHD

Individual provider Psychologist · NPI 1306850490

Mary P O'Brien, PHD is a Psychologist in Los Angeles, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

300 Medical Plz
Los Angeles, CA 90095-0001
Phone: (310) 825-9989
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence PSY19344 (CA)

Record details

NPI number1306850490
Entity typeIndividual (Type 1)
GenderFemale
Credentials PHD
Sole proprietorNo
NPI enumeratedJuly 27, 2006
Last updated in NPPESMay 1, 2012

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