Gene Lee Chang, M.D.
NPI 1033240411ActiveIndividual· Internal Medicine, Gastroenterology· Munster, IN
Internal Medicine, Gastroenterology (M.D.) in Munster, Indiana, trained at Chicago College of Medicine and Surgery (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $406,386 for 987 claims, against $127,796 paid for services in 2024. Olympus America Inc. was the largest of 6 companies reporting payments in 2025, $389.95 in all, mostly food and beverage.
Overview
| NPI | 1033240411 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 8, 2007 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | — | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 745 |
|---|---|
| Services billed | 1,088 across 42 procedure codes |
| Paid by Medicare | $127,796 |
Part D prescriptions in 2024
| Prescriptions (claims) | 987 · 2,073 30-day fills |
|---|---|
| Patients | 525 |
| Total drug cost | $406,386 |
| Generic share | 77% of claims |
Education and affiliations
| Medical school | Chicago College of Medicine and Surgery |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- Community Care Network IncMunster, IN · 379 clinicians
Hospital affiliations
- Community HospitalMunster, IN
- St Mary Medical Center IncHobart, IN
Other facilities
- Powers Health Rehabilitation CenterInpatient rehabilitation facility · Crown Point, IN
Industry payments (Open Payments)
- 2025$389.95 · 10 payments from 6 companies
- 2024$3,292 · 44 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Olympus America Inc. | $122.25 | 1 |
| Madrigal Pharmaceuticals | $116.93 | 2 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $51.20 | 3 |
| Abbvie Inc. | $48.73 | 2 |
| Genzyme Corporation | $31.49 | 1 |
What the 2025 payments were for
- Food and Beverage$389.95 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All Internal Medicine, Gastroenterology providers in Indiana →