Quick answers
- Which hospitals does John G. Mathis work at?
- Medicare's official clinician data lists John G. Mathis at 3 hospitals: Memorial Hospital of South Bend, Saint Joseph Regional Medical Center and Saint Joseph Regional Medical Center - Plymouth. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John G. Mathis see patients?
- Medicare's clinician data lists 2 practice locations, including South Bend, IN and Plymouth, IN. Call before your visit to confirm the address.
- What is John G. Mathis's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Gastroenterology.
- Does John G. Mathis accept Medicare assignment?
- Yes. Medicare's clinician data says John G. Mathis 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 G. Mathis?
- (574) 234-0049, as listed in official Medicare / NPI Registry data.
- What is John G. Mathis's NPI number?
- 1427051341. 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 G. Mathis works
Medicare's Facility Affiliation Data lists John G. Mathis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Memorial Hospital of South BendSouth Bend, IN · Acute Care Hospital · CCN 150058
- Saint Joseph Regional Medical CenterMishawaka, IN · Acute Care Hospital · CCN 150012
- Saint Joseph Regional Medical Center - PlymouthPlymouth, IN · Acute Care Hospital · CCN 150076
Practice locations
Addresses where John G. Mathis is enrolled with Medicare (CMS data updated 2026-10-02).
- 17501 Generations DrSouth Bend, IN 46635 (574) 234‑0049
- 1919 Lake AvePlymouth, IN 46563 (574) 780‑8602
Group practices
Medicare enrollment lists John G. Mathis as a member of this group (CMS data updated 2026-10-02).
- Michiana Gastroenterology, Inc12 clinicians in the group
Specialties
- Internal Medicineprimary
- Gastroenterologyalso
Other internal medicine doctors in South Bend
Clinicians with the same Medicare primary specialty in South Bend, IN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Indiana University School Of Medicine |
| Graduation year | 1976 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427051341 |
| 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