John Allen Walker Jr., M.D.
NPI 1477780344ActiveIndividual· Radiology, Vascular & Interventional Radiology· San Antonio, TX
Radiology, Vascular & Interventional Radiology (M.D.) in San Antonio, Texas, trained at University of Texas Medical School at San Antonio (class of 2007). Mostly services rather than prescriptions: Medicare paid $49,416 for 222 patients in 2024, with only 41 Part D claims. Guerbet LLC was the largest of 4 companies reporting payments in 2025, $7,164 in all, mostly honoraria.
Overview
| NPI | 1477780344 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 17, 2009 |
| Last updated in NPPES | Dec 11, 2024 |
| Certified by provider | Dec 11, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Vascular & Interventional Radiology Primary | 2085R0204X | P1944 | TX |
| Radiology, Diagnostic Radiology | 2085R0202X | P1944 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 222 |
|---|---|
| Services billed | 682 across 120 procedure codes |
| Paid by Medicare | $49,416 |
Part D prescriptions in 2024
| Prescriptions (claims) | 41 · 41 30-day fills |
|---|---|
| Patients | 20 |
| Total drug cost | $327.10 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at San Antonio |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Diagnostic Radiology |
Medical group
- University of Texas Health Science Center at San AntonioSan Antonio, TX · 1,297 clinicians
Hospital affiliations
- University Health SystemSan Antonio, TX
- Ut Health San Antonio Multispecialty & Research HoSan Antonio, TX
Industry payments (Open Payments)
- 2025$7,164 · 10 payments from 4 companies
- 2024$11,836 · 24 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Guerbet LLC | $5,000 | 1 |
| Boston Scientific Corporation | $2,108 | 7 |
| Medtronic, Inc. | $36.80 | 1 |
| Siemens Medical Solutions USA, Inc. | $18.70 | 1 |
What the 2025 payments were for
- Honoraria$5,000 · 1 payment
- Food and Beverage$1,466 · 7 payments
- Travel and Lodging$697.49 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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