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

Dr. Mariela M. Costello, PSYD

Individual provider Psychologist · NPI 1801145727

Dr. Mariela M. Costello, PSYD is a Psychologist in Los Altos, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2012
Specialties on file
2
What do these letters mean?
PSYD — Doctor of Psychology
A doctoral psychologist trained primarily for clinical practice.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

919 Fremont Ave Ste 202
Los Altos, CA 95020
Phone: (408) 220-3268
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence PSY23277 (CA)
Psychologist Taxonomy 103T00000X · Licence PSY23277 (CA)

Record details

NPI number1801145727
Entity typeIndividual (Type 1)
GenderFemale
Credentials PSYD
Sole proprietorYes
NPI enumeratedSeptember 6, 2012
Last updated in NPPESOctober 2, 2018

Other providers in Los Altos