NPI age
9 years
Enumerated 2016-08-28
● Active
Type 1 · Individual
DR. William Cortland Guy, PH.D.
Guy is 1 of 208 psychologist providers in San Antonio and 1 of 2632 in Texas.
Primary specialty
Psychologist
Plus 3 subspecialties
Licensed in
TX, MI
2 states
Status
Active
No deactivations on record
Last NPPES update
2019-11-21
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
2 states
Top 95% — 4% of peers are multi-state
Subspecialties
2
In the 24% of peers with subspecialties
NPI lifetime · 2016 → 2026
2016-08Enumerated in NPPES
2016
2026
Where they practice
Practice location
8535 Tom Slick
San Antonio, TX 782293367
Mailing address
8535 Tom Slick
San Antonio, TX 782293367
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 provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a...
-
PsychologistA psychologist who develops and applies scientific knowledge to the delivery of psychological services to infants, toddlers, children and adolescents within their social context. Of particular importance to the specialty of clinical...
Practice context
Part of a multi-provider practice. 72 other active providers share this practice address in NPPES.
Recently enumerated nearby: 6 new psychologist providers have been added in San Antonio in the last 180 days.
See all →
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- 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.