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

John Mark Walker, PHD

Individual provider Psychologist · NPI 1669755864

John Mark Walker, PHD is a Psychologist in Livermore, Colorado. Licensed in Colorado. Registered with an NPI since 2011.

Licensed in
CO
In the registry since
2011
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

475 Red Nose Mesa Ln
Livermore, CO 80536-8935
Phone: (970) 495-0920
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

Psychologist (primary) Taxonomy 103T00000X · Licence 1875 (CO)

Record details

NPI number1669755864
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedSeptember 23, 2011
Last updated in NPPESSeptember 23, 2011