Diane Duyen T. Nguyen, DO
NPI 1023233756ActiveIndividual· Internal Medicine, Medical Oncology· McAllen, TX
Internal Medicine, Medical Oncology (DO) in McAllen, Texas, trained at West Virginia School of Osteopathic Medicine (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $266,351 for 293 claims, against $37,668 paid for services in 2024. Sobi, Inc was the largest of 2 companies reporting payments in 2025, $351.21 in all, mostly education.
Overview
| NPI | 1023233756 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Apr 16, 2007 |
| Last updated in NPPES | Oct 3, 2024 |
| Certified by provider | Oct 3, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | M3045 | TX |
| Internal Medicine, Hematology & Oncology | 207RH0003X | DO1698 | TN |
| Internal Medicine, Hematology & Oncology | 207RH0003X | M3045 | TX |
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 - Medical Oncology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 20 |
|---|---|
| Services billed | 232 across 12 procedure codes |
| Paid by Medicare | $37,668 |
Part D prescriptions in 2024
| Prescriptions (claims) | 293 · 508 30-day fills |
|---|---|
| Patients | 93 |
| Total drug cost | $266,351 |
| Generic share | 81% of claims |
Education and affiliations
| Medical school | West Virginia School of Osteopathic Medicine |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Medical Oncology |
| Secondary specialties | Hematology |
Medical group
- University of Texas Rio Grande ValleyHarlingen, TX · 85 clinicians
Hospital affiliations
- Rio Grande Regional HospitalMcAllen, TX
- South Texas Health SystemEdinburg, TX
Industry payments (Open Payments)
- 2025$351.21 · 4 payments from 2 companies
- 2024$268.76 · 8 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sobi, Inc | $199.94 | 2 |
| Caris Mpi, Inc. | $151.27 | 2 |
What the 2025 payments were for
- Education$199.94 · 2 payments
- Food and Beverage$151.27 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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