Chang Wen Chen, MD
NPI 1033220314ActiveIndividual· Family Medicine· Knoxville, TN
Family Medicine (MD) in Knoxville, Tennessee, trained at University of Alabama School of Medicine (class of 1993). Their prescriptions cost Medicare Part D more than their services did: $528,495 for 8,147 claims, against $60,352 paid for services in 2024. Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) was the largest of 9 companies reporting payments in 2025, $834.94 in all, mostly food and beverage.
Overview
| NPI | 1033220314 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Aug 31, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | MD27018 | TN |
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 - General Practice (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 187 |
|---|---|
| Services billed | 2,464 across 33 procedure codes |
| Paid by Medicare | $60,352 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,147 · 16,028 30-day fills |
|---|---|
| Patients | 427 |
| Total drug cost | $528,495 |
| Generic share | 90% of claims |
Education and affiliations
| Medical school | University of Alabama School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | General Practice |
Medical group
- Chang Wen Chen MD PCKnoxville, TN · 2 clinicians
Hospital affiliations
- Fort Sanders Regional Medical CenterKnoxville, TN
- Methodist Medical Center of Oak RidgeOak Ridge, TN
- Parkwest Medical CenterKnoxville, TN
Industry payments (Open Payments)
- 2025$834.94 · 46 payments from 9 companies
- 2024$482.69 · 29 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $289.72 | 18 |
| Novo Nordisk Inc | $127.91 | 6 |
| Amgen Inc. | $93.21 | 5 |
| Astrazeneca Pharmaceuticals LP | $75.67 | 4 |
| Abbvie Inc. | $67.76 | 4 |
What the 2025 payments were for
- Food and Beverage$834.94 · 46 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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