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

Mark J Williams Ph D , PLLC

Organization Clinical Psychologist · NPI 1639245962

Mark J Williams Ph D , PLLC is a Clinical Psychologist in Dallas, Texas. Licensed in Texas. Registered with an NPI since 2006.

Licensed in
TX
In the registry since
2006
What do these letters mean?
PLLC — Professional limited liability company
A form of business registration, not a clinical qualification.

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Practice location Address checks out

5924 Royal Ln Ste 211
Dallas, TX 75230-3863
Phone: (214) 927-8456
Fax: (214) 361-2335
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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 32192 (TX)

Record details

NPI number1639245962
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Mark Williams — Managing Member · (214) 927-8456
NPI enumeratedNovember 28, 2006
Last updated in NPPESAugust 22, 2020
Mailing address833 Kirkwood Dr, Dallas, TX 75218-2283

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