John Karagiannis, M.D.
NPI 1386647170 · Gastroenterology Physician · Elkhart, IN
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Karagiannis, M.D. is a Gastroenterology Physician provider in Elkhart, IN (NPI 1386647170).
Provider details
- NPI number
- 1386647170
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 01041123A (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
1,741 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) |
|---|---|---|
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Tracing93005 | 316 | $6 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 243 | $120 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 178 | $9 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 122 | $233 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 114 | $91 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High Risk |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 695 | 230 |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 333 | 316 |
| Famotidine | 312 | 112 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 198 | 197 |
| Omeprazole | 139 | 47 |
| Mesalamine | 43 | — |
| Esomeprazole Magnesium | 26 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$402 across 21 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
- 2010-08-16
Frequently asked questions
- What is John Karagiannis's NPI number?
- John Karagiannis's National Provider Identifier (NPI) is 1386647170, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Karagiannis's specialty?
- John Karagiannis is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is John Karagiannis located?
- John Karagiannis's practice location on file with NPPES is 303 S Nappanee St, Elkhart, IN 46514-2066.
- What is John Karagiannis's phone number?
- The practice phone number listed in the NPPES registry for John Karagiannis is (574) 296-3341.
- Does John Karagiannis accept Medicare?
- John Karagiannis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Karagiannis's NPI active?
- Yes — John Karagiannis's NPI (1386647170) is active in the NPPES registry as of the last update on 2010-08-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.