Quick answers
- Which hospitals does John A. Walker Jr. work at?
- Medicare's official clinician data lists John A. Walker Jr. at 2 hospitals: University Health System and UT Health San Antonio Multispecialty & Research Ho…. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John A. Walker Jr. see patients?
- Medicare's clinician data lists 4 practice locations, including San Antonio, TX. Call before your visit to confirm the address.
- What is John A. Walker Jr.'s specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does John A. Walker Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Walker Jr. accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for John A. Walker Jr.?
- (210) 358-4000, as listed in official Medicare / NPI Registry data.
- What is John A. Walker Jr.'s NPI number?
- 1477780344. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John A. Walker Jr. works
Medicare's Facility Affiliation Data lists John A. Walker Jr. at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- University Health SystemSan Antonio, TX · Acute Care Hospital · CCN 450213
- UT Health San Antonio Multispecialty & Research Ho…San Antonio, TX · Acute Care Hospital · CCN 670335
Practice locations
Addresses where John A. Walker Jr. is enrolled with Medicare (CMS data updated 2026-10-02).
- 4502 Medical DrSan Antonio, TX 78229 (210) 358‑4000
- 7703 Floyd Curl DrSan Antonio, TX 78229 (210) 450‑9000
- 8311 Ewing Halsell DrSan Antonio, TX 78229
- 8431 Fredericksburg RdSan Antonio, TX 78229
Group practices
Medicare enrollment lists John A. Walker Jr. as a member of this group (CMS data updated 2026-10-02).
- University of Texas Health Science Center at San Antonio1,297 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in San Antonio
Clinicians with the same Medicare primary specialty in San Antonio, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 2007 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1477780344 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians