An Viet Nguyen, MD
NPI 1619439833ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Duarte, CA
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) with City of Hope Medical Foundation, practicing in Duarte, California. Their prescriptions cost Medicare Part D more than their services did: $162,045 for 354 claims, against $37,284 paid for services in 2024. Ascendis Pharma Endocrinology Inc was the largest of 4 companies reporting payments in 2025, $279.65 in all, mostly food and beverage. Lists Pomona Valley Hospital Medical Center as a hospital affiliation.
Overview
| NPI | 1619439833 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 5, 2019 |
| Last updated in NPPES | Sep 23, 2024 |
| Certified by provider | Sep 23, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | A176077 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 245 |
|---|---|
| Services billed | 532 across 15 procedure codes |
| Paid by Medicare | $37,284 |
Part D prescriptions in 2024
| Prescriptions (claims) | 354 · 779 30-day fills |
|---|---|
| Patients | 132 |
| Total drug cost | $162,045 |
| Generic share | 55% of claims |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
Hospital affiliation
- Pomona Valley Hospital Medical CenterPomona, CA
Industry payments (Open Payments)
- 2025$279.65 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ascendis Pharma Endocrinology Inc | $125.00 | 1 |
| Amgen Inc. | $125.00 | 1 |
| Madrigal Pharmaceuticals | $15.24 | 1 |
| Radius Health, Inc. | $14.41 | 1 |
What the 2025 payments were for
- Food and Beverage$279.65 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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