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

Mr. William Valdivia-Mairesse, PSYD

Individual provider Psychologist · NPI 1245460070

Mr. William Valdivia-Mairesse, PSYD is a Psychologist in Los Angeles, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2009
What do these letters mean?
PSYD — Doctor of Psychology
A doctoral psychologist trained primarily for clinical practice.

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Practice location Address checks out

12400 Wilshire Blvd Ste 230
Los Angeles, CA 90025-1019
Phone: (424) 229-1838
Fax: (310) 399-9358
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence PSY24368 (CA)

Record details

NPI number1245460070
Entity typeIndividual (Type 1)
GenderMale
Credentials PSYD
Sole proprietorYes
NPI enumeratedJuly 14, 2009
Last updated in NPPESSeptember 10, 2013

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