WILLIAM THOMASON
NPI 1427380377
Psychologist - Clinical in Sherman, TX

Q: What is El Rio Psychological Services, P.C.'s NPI number?

The NPI number for El Rio Psychological Services, P.C. is 1427380377. It was assigned to this organization in the NPPES registry on February 3, 2010. The provider is doing business as William Thomason.

Q: What is El Rio Psychological Services, P.C.'s specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Active since February 03, 2010

402 W LAMAR ST, SUITE 102, SHERMAN, TX 75090(903) 893-0298(903) 892-6323 Get Directions Write a Review

NPPES record last updated: February 3, 2010. Verified against the NPPES registry weekly; last sync: August 16, 2026.

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About William Thomason NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

WILLIAM THOMASON (NPI 1427380377) is a healthcare organization registered as a clinical in Sherman, Texas and active in the NPI registry since February 2010. The organization lists William O Thomason, Clinical Psychologist, as its authorized official.

NPPES Registry Identity

NPI1427380377

Entity TypeOrganization

Primary Taxonomy103TC0700X

Legal Business NameEL RIO PSYCHOLOGICAL SERVICES, P.C.

Location Address402 W LAMAR ST, SUITE 102Sherman, TX 75090-5885

Mailing AddressPo Box 1154Sherman, TX 75091-1154 · (903) 893-0298 · Fax (903) 892-6323

Phone(903) 893-0298

Fax(903) 892-6323

Organization SubpartNo

Authorized OfficialWilliam O ThomasonClinical Psychologist · (972) 841-3987

Enumeration DateFebruary 3, 2010

✔ NPI 1427380377 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers

Taxonomy Code103TC0700X

License✔ Licensed in TX · 25481

Definition

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.

402 W LAMAR ST, Sherman, TX 75090

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Other Names 1

Doing Business AsWilliam Thomason

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KATHLEEN HOY, PHD, PLLC

Counselor (Professional)

402 W LAMAR ST, SUITE 105
SHERMAN, TX 75090

Grayson County (972) 529-8573

KATHERINE UNDERWOOD LPC

Counselor (Professional)

402 W LAMAR ST, SUITE 102
SHERMAN, TX 75090

Grayson County (903) 893-0298

MRS. JODI MCKEE ATR-BC, LPC

Counselor (Mental Health)

402 W LAMAR ST, SUITE 102
SHERMAN, TX 75090

Grayson County (903) 868-2961

LAKE RIDGE PSYCHOLOGICAL SERVICES, PC

Psychologist (Clinical)

402 W LAMAR ST, SUITE 102
SHERMAN, TX 75090

Grayson County (903) 893-0298

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is El Rio Psychological Services, P.C.'s NPI number?

The NPI number for El Rio Psychological Services, P.C. is 1427380377. It was assigned to this organization in the NPPES registry on February 3, 2010. The provider is doing business as William Thomason.

Where is El Rio Psychological Services, P.C. located?

El Rio Psychological Services, P.C. is located at 402 W Lamar St Suite 102, Sherman, TX 75090. The listed phone number is (903) 893-0298.

What is El Rio Psychological Services, P.C.'s specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

When was this NPI record last updated?

The NPPES record for El Rio Psychological Services, P.C. was last updated on February 3, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.