John Grady Williams, M.D.
NPI 1902855281ActiveIndividual· Radiology, Diagnostic Radiology· Austin, TX
Radiology, Diagnostic Radiology (M.D.) in Austin, Texas, trained at Texas Tech University Health Science Center School of Medicine (class of 2001). Medicare paid $165,918 for services to 3,370 patients in 2024. Penumbra, Inc. was the largest of 2 companies reporting payments in 2025, $271.75 in all, mostly food and beverage.
Overview
| NPI | 1902855281 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 6, 2006 |
| Last updated in NPPES | Oct 3, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Diagnostic Radiology Primary | 2085R0202X | M6955 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Diagnostic Radiology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 3,370 |
|---|---|
| Services billed | 16,325 across 166 procedure codes |
| Paid by Medicare | $165,918 |
Education and affiliations
| Medical school | Texas Tech University Health Science Center School of Medicine |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Diagnostic Radiology |
Medical groups
- Singleton Associates PATyler, TX · 838 clinicians
- Austin Radiological AssociationAustin, TX · 127 clinicians
Hospital affiliations
- Ascension Seton HaysKyle, TX
- Ascension Seton Highland LakesBurnet, TX
- Ascension Seton Medical Center AustinAustin, TX
- Ascension Seton WilliamsonRound Rock, TX
- St David's Medical CenterAustin, TX
Industry payments (Open Payments)
- 2025$271.75 · 2 payments from 2 companies
- 2024$95.73 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Penumbra, Inc. | $137.56 | 1 |
| Dexcom, Inc. | $134.19 | 1 |
What the 2025 payments were for
- Food and Beverage$271.75 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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