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Dr. William Cortland Guy , PhD

Psychologist β€’ San Antonio, TX

Active NPI 1942756242 Individual Practitioner Male Practitioner
Practice location in NPPES

8535 Tom Slick
San Antonio, TX 782293367

Call 2105932157 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

8535 Tom Slick

San Antonio, TX 782293367

Telephone 2105932157
Organization at the Same NPPES Address or Phone
Southwest Psychiatric Physicians Facility NPI 1639286370

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

NPI first issued

2016

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Medicare assignment not listed

CMS data do not show whether this clinician accepts Medicare assignment. This does not mean they do not accept Medicare. Ask the office.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, β€œDoes your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.

Guide: How Medicare covers telehealth

Compared with the same specialty in San Antonio and Texas

171 active clinicians are listed under Psychologist with a practice address in San Antonio, TX (2,162 in Texas).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in San Antonio

7% of these 171 clinicians have the CMS telehealth indicator.

16.4% of these 171 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo Β· Report an error.

Specialties & License Numbers Reported to NPPES

Psychologist Primary Specialty

NUCC Taxonomy Code: 103T00000X

License # reported to NPPES TX 37345

A 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, methods, and procedures, for the purpose of preventing or eliminating symptomatic, maladaptive, or undesired behavior and of enhancing interpersonal relationships, work and life adjustment, personal effectiveness, behavioral health, and mental health. The practice of psychology includes, but is not limited to, psychological testing and the evaluation or assessment of personal characteristics, such as intelligence, personality, abilities, interests, aptitudes, and neuropsychological functioning; counseling, psychoanalysis, psychotherapy, hypnosis, biofeedback, and behavior analysis and therapy; diagnosis and treatment of mental and emotional disorder or disability, alcoholism and substance abuse, disorders of habit or conduct, as well as of the psychological aspects of physical illness, accident, injury, or disability; and psycheducational evaluation, therapy, remediation, and consultation. Psychological services may be rendered to individuals, families, groups and the public.

Psychologist - Clinical

NUCC Taxonomy Code: 103TC0700X

License # reported to NPPES MI 6301014808

A 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 specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

Psychologist - Clinical

NUCC Taxonomy Code: 103TC0700X

License # reported to NPPES TX 37345

A 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 specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

Psychologist - Clinical Child & Adolescent

NUCC Taxonomy Code: 103TC2200X

License # reported to NPPES TX 37345

A 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 child psychology is an understanding of the basic psychological needs of children and adolescents, and how the family and other social contexts influence the socio-emotional adjustment, cognitive development, behavioral adaptation and health status of children and adolescents.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Texas Medical Board.
Look Up on State Board Site

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

14 listed
Jesse Alvarado , PMHNP-BC

Nurse Practitioner - Psychiatric/Mental Health

NPI 1699114793

Psychiatric-Mental Health Nurse Practitioner (Board Certified)

Laura Berardo

Psychiatry & Neurology - Child & Adolescent Psychiatry

NPI 1720664295
Dr. Gil Cepeda-Abril , MD

Psychiatry & Neurology - Child & Adolescent Psychiatry

NPI 1932217676

Doctor of Medicine (M.D.)

Dr. Lizmarie Gonzalez-Vega , MD

Psychiatry & Neurology - Child & Adolescent Psychiatry

NPI 1770764904

Doctor of Medicine (M.D.)

Dr. Jaime Guzman , DO

Psychiatry & Neurology - Child & Adolescent Psychiatry

NPI 1730685892

Doctor of Osteopathic Medicine (D.O.)

Dr. Jacqueline Herrera , PsyD

Psychologist - Clinical

NPI 1982131694

Doctor of Psychology (Psy.D.)

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

12 Historical Events
πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) November 21, 2019

Psychologist (license number reported to NPPES: TX 37345)

βœ…
NPI Profile Active March 18, 2017

NPI status registered as active in NPPES database

πŸ“
Updated Business Mailing Address March 18, 2017

Registered at 8535 TOM SLICK, SAN ANTONIO, TX 782293367

πŸ“
Updated Practice Location March 18, 2017

Registered at 8535 TOM SLICK, SAN ANTONIO, TX 782293367 (Tel: 2105932157)

πŸ‘€
Provider Name / Credentials Updated March 18, 2017

Recorded as WILLIAM GUY, PH.D.

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) March 18, 2017

Psychologist (license number reported to NPPES: MI 6301014808)

βœ…
NPI Profile Active August 28, 2016

NPI status registered as active in NPPES database

πŸ“
Practice Location (Initial Record) August 28, 2016

Registered at 8535 TOM SLICK, SAN ANTONIO, TX 782293367 (Tel: 2105932157)

πŸ“
Business Mailing Address (Initial Record) August 28, 2016

Registered at 6215 VIA LA CANTERA, APT. 436, SAN ANTONIO, TX 782562538

πŸ‘€
Provider Name / Credentials (Initial Record) August 28, 2016

Recorded as WILLIAM GUY, PH.D.

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) August 28, 2016

Psychologist (license number reported to NPPES: TX 37345)

🟒
Initial NPI Registration & Enumeration August 28, 2016

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1942756242
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: August 28, 2016
Last Update: November 21, 2019
Sole Proprietor: No

Other Psychologists in San Antonio

All Psychologists in San Antonio

Mailing Address

8535 Tom Slick

San Antonio, TX 782293367

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.