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

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 →

Practice location Address checks out

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

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
Mailing address475 Red Nose Mesa Ln, Livermore, CO 80536-8935