Joy Weiling Chang, M.D.
NPI 1194091827ActiveIndividual· Internal Medicine, Gastroenterology· Ann Arbor, MI
Internal Medicine, Gastroenterology (M.D.) in Ann Arbor, Michigan, trained at University of Maryland School of Medicine (class of 2012). Their prescriptions cost Medicare Part D more than their services did: $78,331 for 132 claims, against $11,961 paid for services in 2024. Takeda Pharmaceuticals U.S.A., Inc. was the largest of 4 companies reporting payments in 2025, $7,428 in all, mostly consulting fees.
Overview
| NPI | 1194091827 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 27, 2012 |
| Last updated in NPPES | Dec 6, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 4301106697 | MI |
| Internal Medicine | 207R00000X | 4301106697 | MI |
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 (MI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 79 |
|---|---|
| Services billed | 128 across 30 procedure codes |
| Paid by Medicare | $11,961 |
Part D prescriptions in 2024
| Prescriptions (claims) | 132 · 223 30-day fills |
|---|---|
| Patients | 25 |
| Total drug cost | $78,331 |
| Generic share | 74% of claims |
Education and affiliations
| Medical school | University of Maryland School of Medicine |
|---|---|
| Graduation year | 2012 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Regents of the University of MichiganAnn Arbor, MI · 3,346 clinicians
Hospital affiliation
- University of Michigan Health SystemAnn Arbor, MI
Industry payments (Open Payments)
- 2025$7,428 · 13 payments from 4 companies
- 2024$8,905 · 15 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Takeda Pharmaceuticals U.S.A., Inc. | $4,020 | 4 |
| Regeneron Pharmaceuticals, Inc. | $2,792 | 2 |
| Genzyme Corporation | $432.62 | 6 |
| Phathom Pharmaceuticals, Inc. | $183.40 | 1 |
What the 2025 payments were for
- Consulting Fee$6,673 · 4 payments
- Food and Beverage$754.74 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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