Gene Chang, M.D.
NPI 1033240411 · Gastroenterology Physician · Munster, IN
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gene Chang, M.D. is a Gastroenterology Physician provider in Munster, IN (NPI 1033240411).
Provider details
- NPI number
- 1033240411
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
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
19 yrs in NPPES registry
- Profile completeness25% of score
83% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
981 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 | 332 | $222 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 280 | $79 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 118 | $92 |
| Colorectal Cancer Screening; Colonoscopy on Individual at High RiskG0105 | 95 | $163 |
| Colorectal Cancer Screening; Colonoscopy on Individual Not Meeting Criteria for High RiskG0121 | 46 | $164 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 418 | 143 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 182 | 180 |
| Sod Sulf/Pot Chloride/Mag Sulfbrand: Sutab | 79 | 79 |
| Omeprazole | 56 | 20 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 37 | 37 |
| Famotidine | 23 | — |
| Sucralfate | 14 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$3,292 across 44 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
- 2007-03-08
- Last updated
- 2007-07-08
Frequently asked questions
- What is Gene Chang's NPI number?
- Gene Chang's National Provider Identifier (NPI) is 1033240411, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gene Chang's specialty?
- Gene Chang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Gene Chang located?
- Gene Chang's practice location on file with NPPES is 9030 Columbia Ave, Munster, IN 46321-2905.
- What is Gene Chang's phone number?
- The practice phone number listed in the NPPES registry for Gene Chang is (219) 836-6002.
- Does Gene Chang accept Medicare?
- Gene Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gene Chang's NPI active?
- Yes — Gene Chang's NPI (1033240411) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.