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

Dr. Mark Allen Williams, PHD

Individual provider Clinical Neuropsychologist · NPI 1801839204

Dr. Mark Allen Williams, PHD is a Clinical Neuropsychologist in Mount Pleasant, South Carolina. Practices as a sole proprietor. Licensed in South Carolina.

Licensed in
SC
In the registry since
2006
Specialties on file
2
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

886 Johnnie Dodds Blvd Ste 102
Mount Pleasant, SC 29464-3190
Phone: (843) 425-7142
Fax: (866) 807-5863
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Neuropsychologist (primary) Taxonomy 103G00000X · Licence 994 (SC)
Clinical Psychologist Taxonomy 103TC0700X · Licence 994 (SC)

Record details

NPI number1801839204
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorYes
NPI enumeratedJune 14, 2006
Last updated in NPPESSeptember 11, 2025

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