Warren Andrew Chang, M.D.
NPI 1407057920ActiveIndividual· Internal Medicine· Abingdon, VA
Internal Medicine (M.D.) with Catawba Valley Medical Center, practicing in Abingdon, Virginia. In 2024 Medicare paid $57,509 for 236 patients, and Part D covered 264 of their prescriptions, 81% of them generic. Sun Pharmaceutical Industries Inc. was the largest of 3 companies reporting payments in 2025, $78.77 in all, mostly food and beverage. Lists Catawba Valley Medical Center as a hospital affiliation.
Overview
| NPI | 1407057920 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 31, 2007 |
| Last updated in NPPES | Mar 22, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 0101241447 | VA |
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 - Hospitalist (NC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 236 |
|---|---|
| Services billed | 662 across 11 procedure codes |
| Paid by Medicare | $57,509 |
Part D prescriptions in 2024
| Prescriptions (claims) | 264 · 282 30-day fills |
|---|---|
| Patients | 111 |
| Total drug cost | $15,557 |
| Generic share | 81% of claims |
Education and affiliations
| Graduation year | 1992 |
|---|---|
| Medicare specialty | Hospitalist |
Medical group
- Catawba Valley Medical CenterHickory, NC · 104 clinicians
Hospital affiliation
- Catawba Valley Medical CenterHickory, NC
Industry payments (Open Payments)
- 2025$78.77 · 3 payments from 3 companies
- 2024$29.56 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sun Pharmaceutical Industries Inc. | $28.17 | 1 |
| Regeneron Healthcare Solutions, Inc. | $25.46 | 1 |
| Inari Medical, Inc. | $25.14 | 1 |
What the 2025 payments were for
- Food and Beverage$78.77 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Abingdon
- 1013986264
- 1033609979
- 1073752036
- 1134678667
- 1164614079
- 1194197475
- 1245681196
- 1356638076
- 1386174944
- 1386267292
- 1467972448
- 1487184974
All 57 internal medicine physicians in Abingdon · All internal medicine physicians in Virginia