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

Dr. Roy W. Johnson, PHD

Individual provider Psychologist · NPI 1932448867

Dr. Roy W. Johnson, PHD is a Psychologist in Vacaville, California. Licensed in California. Registered with an NPI since 2013.

Licensed in
CA
In the registry since
2013
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

1600 California Dr
Vacaville, CA 95656-2000
Phone: (707) 448-6841
Show map & directions

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

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence PSY17332 (CA)

Record details

NPI number1932448867
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedFebruary 13, 2013
Last updated in NPPESFebruary 13, 2013

Other providers in Vacaville