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

Individual provider Clinical Psychologist · NPI 1538209747

Dr. Mark Holder Barnes, PHD is a Clinical Psychologist in Knoxville, Tennessee. Practices as a sole proprietor. Licensed in Tennessee.

Licensed in
TN
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

1640 W Clinch Ave
Knoxville, TN 37916-2524
Phone: (865) 637-5848
Fax: (865) 525-4026
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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 P1669 (TN)

Record details

NPI number1538209747
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedFebruary 7, 2007
Last updated in NPPESJuly 8, 2007
Mailing address1640 W Clinch Ave, Knoxville, TN 37916-2524

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