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

Individual provider Clinical Psychologist · NPI 1669403580

Dr. John A Chellsen, PHD is a Clinical Psychologist in Stockton, California. Qualified in 1983, 43 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California.

Years since qualifying
43
Licensed in
CA
In the registry since
2006
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

2155 W March Ln Ste 2B
Stockton, CA 95207-6420
Phone: (209) 473-4211
Fax: (209) 473-0610
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence PSY8979 (CA)

Record details

NPI number1669403580
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedJuly 6, 2006
Last updated in NPPESJuly 8, 2007
Mailing address2155 W March Ln, Ste 2b, Stockton, CA 95207-6420

Medicare enrollment

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

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1983 (43 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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