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 provides Clinical Psychologist services 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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