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

Dr. Mark Williams Stevens, PHD

Individual provider Clinical Psychologist · NPI 1336269398

Dr. Mark Williams Stevens, PHD is a Clinical Psychologist in Poway, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2007
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

13525 Midland Rd Ste J
Poway, CA 92064-4771
Phone: (858) 207-8322
Fax: (858) 748-8050
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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 20859 (CA)

Record details

NPI number1336269398
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedMarch 30, 2007
Last updated in NPPESJuly 8, 2007
Mailing address13525 Midland Rd, Suite J, Poway, CA 92064-4771

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