Joseph Yun Jo Chang, MD
NPI 1417968256ActiveIndividual· Internal Medicine, Gastroenterology· Denver, CO
Internal Medicine, Gastroenterology (MD) with Altru Health System, practicing in Denver, Colorado. 290 Medicare patients in 2024, $44,896 paid; nearly all of their 67 Part D prescriptions were generic (97%). Phathom Pharmaceuticals, Inc. reported $169.00 in payments in 2025, mostly food and beverage. Lists Altru Hospital as a hospital affiliation.
Overview
| NPI | 1417968256 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 10, 2006 |
| Last updated in NPPES | Aug 9, 2023 |
| Certified by provider | Aug 9, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | DR.0070441 | CO |
| Internal Medicine, Gastroenterology | 207RG0100X | MD60212074 | WA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (ND) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 290 |
|---|---|
| Services billed | 463 across 17 procedure codes |
| Paid by Medicare | $44,896 |
Part D prescriptions in 2024
| Prescriptions (claims) | 67 · 144 30-day fills |
|---|---|
| Patients | 38 |
| Total drug cost | $1,802 |
| Generic share | 97% of claims |
Education and affiliations
| Graduation year | 2005 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- Altru Health SystemGrand Forks, ND · 684 clinicians
Hospital affiliation
- Altru HospitalGrand Forks, ND
Industry payments (Open Payments)
- 2025$169.00 · 2 payments from 1 company
- 2024$81.68 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Phathom Pharmaceuticals, Inc. | $169.00 | 2 |
What the 2025 payments were for
- Food and Beverage$169.00 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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