NPI age
9 years
Enumerated 2016-09-01
● Active
Type 1 · Individual
DR. Theron Liddell, PH.D.
Liddell is 1 of 9 psychologist providers in Harlingen and 1 of 2632 in Texas.
Primary specialty
Psychologist
Plus 1 subspecialty
Licensed in
—
0 states
Status
Active
No deactivations on record
Last NPPES update
2016-09-01
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
9 years
↓ 4 yr below median (13 yr)
State licenses
1 state
4% of peers hold multiple states
Subspecialties
1
In the 24% of peers with subspecialties
NPI lifetime · 2016 → 2026
2016-09Enumerated in NPPES
2016
2026
Where they practice
Practice location
2106 Treasure Hills Blvd, # 129
Harlingen, TX 785508736
Mailing address
2106 Treasure Hills Blvd, # 129
Harlingen, TX 785508736
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,...
-
PsychologistA psychologist who specializes in general practice and health service. It focuses on how people function both personally and in their relationships at all ages. Counseling psychology addresses the emotional, social, work, school and...
Practice context
Part of a multi-provider practice. 79 other active providers share this practice address in NPPES.
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.