Quick answers
- Which hospitals does John N. Loizeaux-Witte work at?
- Medicare's official clinician data lists John N. Loizeaux-Witte at 5 hospitals: Allen Hospital, Medical Center Hospital, Mercy Hospital Ada, Phoebe Sumter Medical Center and University of California Davis Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John N. Loizeaux-Witte see patients?
- Medicare's clinician data lists 4 practice locations, including Gonzales, TX, Keller, TX and Garland, TX. Call before your visit to confirm the address.
- What is John N. Loizeaux-Witte's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does John N. Loizeaux-Witte accept Medicare assignment?
- Yes. Medicare's clinician data says John N. Loizeaux-Witte 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 N. Loizeaux-Witte?
- (830) 672-7581, as listed in official Medicare / NPI Registry data.
- What is John N. Loizeaux-Witte's NPI number?
- 1992850556. 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 N. Loizeaux-Witte works
Medicare's Facility Affiliation Data lists John N. Loizeaux-Witte at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Allen HospitalWaterloo, IA · Acute Care Hospital · CCN 160110
- Medical Center HospitalOdessa, TX · Acute Care Hospital · CCN 450132
- Mercy Hospital AdaAda, OK · Acute Care Hospital · CCN 370020
- Phoebe Sumter Medical CenterAmericus, GA · Acute Care Hospital · CCN 110044
- University of California Davis Medical CenterSacramento, CA · Acute Care Hospital · CCN 050599
Practice locations
Addresses where John N. Loizeaux-Witte is enrolled with Medicare (CMS data updated 2026-10-02).
- 1110 N Sarah Dewitt Dr, Gonzales Health SystemGonzales, TX 78629 (830) 672‑7581
- 2400 Spruce CtKeller, TX 76262 (952) 595‑1100
- 3114 Bluffview DrGarland, TX 75043 (952) 595‑1100
- 4810 Rosinante RdEl Paso, TX 79922 (925) 595‑1100
Group practices
Medicare enrollment lists John N. Loizeaux-Witte as a member of these groups (CMS data updated 2026-10-02).
- Regents of the University of California2,089 clinicians in the group
- Regents of the Univ of Ca1,584 clinicians in the group
- Singleton Associates PA838 clinicians in the group
- Northside Radiology Associates LLC385 clinicians in the group
- Virtual Radiologic Professionals of Texas I, PA35 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Gonzales
Clinicians with the same Medicare primary specialty in Gonzales, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Southern California Keck School Of Medicine |
| Graduation year | 1990 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1992850556 |
| 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