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

Individual provider Counselor · NPI 1801126065

Clayton Dane Mathewson, PHD is a Counselor in Portland, Oregon. Practices as a sole proprietor. Registered with an NPI since 2010.

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

1215 SW 18th Ave
Portland, OR 97205-1711
Phone: (503) 224-1223
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Counselor (primary) Taxonomy 101Y00000X

Record details

NPI number1801126065
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedJanuary 10, 2010
Last updated in NPPESJanuary 10, 2010

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