NPI age
19 years
Enumerated 2007-03-14
● Active
Type 1 · Individual
Mark Williams, PH.D.
Williams is 1 of 301 psychologist providers in Dallas and 1 of 2632 in Texas.
Primary specialty
Psychologist
Licensed in
TX
1 state
Status
Active
No deactivations on record
Last NPPES update
2024-07-22
Source: monthly bulk 2026-05
Sole proprietor
No
May be part of a larger org
How this provider compares
Across 2632 active psychologist providers in Texas.
NPI age
19 years
↑ 6 yr above median (13 yr)
State licenses
1 state
4% of peers hold multiple states
Subspecialties
0
24% of peers hold subspecialties
NPI lifetime · 2007 → 2026
2007-03Enumerated in NPPES
2007
2026
Where they practice
Practice location
18170 Dallas Pkwy Ste 502
Dallas, TX 752877151
Mailing address
16227 Shadybank Dr
Dallas, TX 752482958
Specialties
-
Psychologist PrimaryA psychologist is an individual who is licensed to practice psychology which is defined as the observation, description, evaluation, interpretation, and modification of human behavior by the application of psychological principles,...
Practice context
Part of a multi-provider practice. 1 other active provider shares this practice address in NPPES.
Recently enumerated nearby: 6 new psychologist providers have been added in Dallas in the last 180 days.
See all →
Provyx · Custom healthcare lists
Need all 2632 Psychologist providers in Texas?
Get the full list as a CSV with verified work emails, direct phones, and LinkedIn URLs.
Request a quote →How to verify this provider
- Confirm the NPI on NPPES.The CMS registry is the system of record. Open NPPES →
- Check the state license is currently active.State licensing boards publish current status; NPPES does not.
- Confirm payer enrollment if billing.NPI presence does not guarantee active enrollment with Medicare, Medicaid, or commercial payers.