DR. GREGORY WILLIAMS M.D.
NPI 1891910659
Psychiatry & Neurology - Psychiatry in Corpus Christi, TX

Q: What is Gregory Williams's NPI number?

The NPI number for Gregory Williams is 1891910659. It was assigned to this individual provider in the NPPES registry on April 16, 2007.

Q: What is Gregory Williams's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Williams was last updated on May 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 months 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.

Active since April 16, 2007PECOS Enrolled

5734 SPOHN DR STE 110, CORPUS CHRISTI, TX 78414(903) 957-0082(903) 957-0351 Get Directions Write a Review

NPPES record last updated: May 8, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 8, 2026, Feb 6, 2026, Sep 30, 2024 and 1 more (4 updates tracked since 2017).

On this page

About Dr. Gregory Williams M.d. NPPES

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

DR. GREGORY WILLIAMS M.D. (NPI 1891910659) is an individual psychiatry provider in Corpus Christi, Texas, licensed in Texas (R0812) and active in the NPI registry since April 2007. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Marcos, and is a graduate of Uniformed Services Uhs Fe Hebert School Of Med (2005).

NPPES Registry Identity

NPI1891910659

Entity TypeIndividualMale

Primary Taxonomy2084P0800X

Provider Legal NameDR. GREGORY WILLIAMSCredential: M.D.

Location Address5734 SPOHN DR STE 110Corpus Christi, TX 78414-4116

Mailing Address425 N Highland Ave Ste 260Sherman, TX 75092-7377 · (903) 957-0082 · Fax (903) 957-0351

Phone(903) 957-0082

Fax(903) 957-0351

Sole ProprietorNo

Medical School CMSUniformed Services Uhs Fe Hebert School Of MedGraduated 2005

Enumeration DateApril 16, 2007

Last NPPES UpdateMay 8, 20264 updates tracked since enumeration

NPPES CertifiedMay 8, 2026

✔ NPI 1891910659 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

License✔ Licensed in TX · R0812

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

5734 SPOHN DR STE 110, Corpus Christi, TX 78414

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Secondary Practice Location 1

Location 1151 Stagecoach Trl Ste 220San Marcos, TX 78666-3863 · Phone (844) 824-8775

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Gregory Williams M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID6305121872

PECOS Enrollment IDI20170323002364

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Gregory Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Progressive Behavioral Health, PLLC

183 mi

Mental Health

308 S FRIENDSWOOD DR STE 200
Friendswood, TX 77546

Reassigned Medicare billing, Texas enrollment
494 clinicians in this Medicare group

NPI 1659567238 (844) 824-8775

Dfw Physicians Medical Associates LLC

412 mi

Internal Medicine

425 N HIGHLAND AVE STE 260
Sherman, TX 75092

Reassigned Medicare billing, Texas enrollment
18 clinicians in this Medicare group

NPI 1376014076 (903) 957-0082

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 78414 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$166.88 typical visit price

range $54.84 – $166.88

Typical copayment $41.72 (range $13.71 – $41.72)

Most-billed visit code 99205

Established Patient

$68.55 typical visit price

range $17.52 – $136.11

Typical copayment $17.13 (range $4.38 – $34.02)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 8

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

MARISOL GARZA LMSW

Social Worker (Clinical)