John Mathis, M.D.
NPI 1427051341 · Gastroenterology Physician · South Bend, IN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Mathis, M.D. is a Gastroenterology Physician provider in South Bend, IN (NPI 1427051341).
Provider details
- NPI number
- 1427051341
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 01026543A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
21 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
947 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 188 | $228 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 157 | $119 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 122 | $72 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 94 | $157 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 77 | $130 |
| Insertion of Guide Wire With Dilation of Esophagus Using a Flexible Endoscope |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 389 | 385 |
| Pantoprazole Sodium | 282 | 93 |
| Omeprazole | 228 | 80 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G | 71 | 70 |
| Mesalamine | 62 | 12 |
| Dicyclomine Hcl | 47 | 18 |
| Esomeprazole Magnesium | 47 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,212 across 178 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-05-24
- Last updated
- 2010-10-04
Frequently asked questions
- What is John Mathis's NPI number?
- John Mathis's National Provider Identifier (NPI) is 1427051341, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Mathis's specialty?
- John Mathis is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is John Mathis located?
- John Mathis's practice location on file with NPPES is 17501 Generations Dr, South Bend, IN 46635-1589.
- What is John Mathis's phone number?
- The practice phone number listed in the NPPES registry for John Mathis is (574) 234-0049.
- Does John Mathis accept Medicare?
- John Mathis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Mathis's NPI active?
- Yes — John Mathis's NPI (1427051341) is active in the NPPES registry as of the last update on 2010-10-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.