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

Johanna Mayer, PHD

Individual provider Psychologist · NPI 1114054335

Johanna Mayer, PHD is a Psychologist in Portola Valley, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2007
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

4370 Alpine Rd Ste 102
Portola Valley, CA 94028-7952
Phone: (650) 851-1164
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence PSY5817 (CA)

Record details

NPI number1114054335
Entity typeIndividual (Type 1)
GenderFemale
Credentials PHD
Sole proprietorYes
NPI enumeratedFebruary 27, 2007
Last updated in NPPESJune 10, 2010

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