Mark J Williams PH.D., PLLC
NPI 1639245962 · Clinical Psychologist · Dallas, TX
Mark J Williams PH.D., PLLC is a Clinical Psychologist organization in Dallas, TX (NPI 1639245962).
Provider details
- NPI number
- 1639245962
- Entity type
- Organization
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Organization subpart
- No
- Authorized official
- Mark Williams, Managing Member(214) 927-8456
- License
- 32192 (TX)
Specialties & taxonomies
Behavioral Health & Social Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-28
- Last updated
- 2020-08-22
Frequently asked questions
- What is Mark J Williams PH.D., PLLC's NPI number?
- Mark J Williams PH.D., PLLC's National Provider Identifier (NPI) is 1639245962, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark J Williams PH.D., PLLC?
- Mark J Williams PH.D., PLLC is classified in the NPPES registry as Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Mark J Williams PH.D., PLLC located?
- Mark J Williams PH.D., PLLC's practice location on file with NPPES is 5924 Royal Ln, Dallas, TX 75230-3863.
- What is Mark J Williams PH.D., PLLC's phone number?
- The practice phone number listed in the NPPES registry for Mark J Williams PH.D., PLLC is (214) 927-8456.
- Who is the authorized official for Mark J Williams PH.D., PLLC?
- The authorized official listed on Mark J Williams PH.D., PLLC's NPPES record is Mark Williams, Managing Member. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark J Williams PH.D., PLLC's NPI active?
- Yes — Mark J Williams PH.D., PLLC's NPI (1639245962) is active in the NPPES registry as of the last update on 2020-08-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.