DR. GREGORY WILLIAMS (M.D.) – Psychiatry Physician, NPI 1891910659
Psychiatry Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
2,132 PSYCHIATRY in TX
Provider Addresses for DR. GREGORY WILLIAMS (M.D.)
4410 MEDICAL DR
SAN ANTONIO, TX 782296306
Phone: (210) 638-2776
Type: Mailing
WHMC GE
2200 BERGQUIST SUITE 1
SANANTONIO LAFB, TX 782365300
Phone: (210) 292-7725
Type: Location
1126 3RD ST
CORPUS CHRISTI, TX 784042312
Phone: (361) 462-4159
Fax: (361) 462-4153
Type: Location
425 N HIGHLAND AVE STE 260
SHERMAN, TX 750927377
Phone: (903) 957-0082
Fax: (903) 957-0351
Type: Mailing
151 Stagecoach Trl Ste 220
San Marcos, TX 786663863
Phone: (844) 824-8775
Type: Location
5734 SPOHN DR STE 110
CORPUS CHRISTI, TX 784144116
Phone: (903) 957-0082
Fax: (903) 957-0351
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $25.
Total Amount is formed as General ($25) + Research ($0) + Ownership ($0) = $25.
Last reported payment date: 2024-01-10 • Largest payer in this snapshot: ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) ($25).
Total Amount
$25
General + Research + Ownership
Payments
1
Total payment records
General Amount
$25
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-01-10
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) | $25 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2017-03-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20170323002364 | I | Psychiatry | TX | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 78229)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| P S Y C H I A T R Y | TX | |
| Nurse Practitioner | TX | |
| Nurse Practitioner | TX | |
| Psychiatry, Internal Medicine | TX |
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