Quick answers
- Which hospitals does Robert Thomas work at?
- Medicare's official clinician data lists Robert Thomas at 3 hospitals: Adventist Health Sonora, Doctors Medical Center and Mark Twain Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Robert Thomas see patients?
- Medicare's clinician data lists 3 practice locations, including Sonora, CA and Greeneville, TN. Call before your visit to confirm the address.
- What is Robert Thomas's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Robert Thomas accept Medicare assignment?
- Yes. Medicare's clinician data says Robert Thomas 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 Robert Thomas?
- (855) 504-4544, as listed in official Medicare / NPI Registry data.
- What is Robert Thomas's NPI number?
- 1104821990. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Robert Thomas works
Medicare's Facility Affiliation Data lists Robert Thomas at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health SonoraSonora, CA · Acute Care Hospital · CCN 050335
- Doctors Medical CenterModesto, CA · Acute Care Hospital · CCN 050464
- Mark Twain Medical CenterSan Andreas, CA · Critical Access Hospital · CCN 051332
Practice locations
Addresses where Robert Thomas is enrolled with Medicare (CMS data updated 2026-10-02).
- 1000 Greenley RdSonora, CA 95370 (855) 504‑4544
- 900 Mono WaySonora, CA 95370 (855) 504‑4544
- 930 Doyle Davis RdGreeneville, TN 37743 (855) 504‑4544
Group practices
Medicare enrollment lists Robert Thomas as a member of this group (CMS data updated 2026-10-02).
- Jason L Hwang MD Inc53 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Sonora
Clinicians with the same Medicare primary specialty in Sonora, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1985 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104821990 |
| 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