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

Dr. Nathanial Ian Chapman, PHD

Individual provider Psychologist · NPI 1477885010

Dr. Nathanial Ian Chapman, PHD is a Clinical Psychologist in Napa, California. Qualified in 2006, 20 years ago. Accepts Medicare assignment. Licensed in California.

Years since qualifying
20
Licensed in
CA
In the registry since
2010
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

2100 Napa Vallejo Hwy
Napa, CA 94558-6293
Phone: (707) 253-5021
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence PSY21835 (CA)

Record details

NPI number1477885010
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedFebruary 8, 2010
Last updated in NPPESMarch 28, 2014

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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