Charles B. Nguyen, M.D.
NPI 1902303431ActiveIndividual· Internal Medicine, Medical Oncology· Irvine, CA
Internal Medicine, Medical Oncology (M.D.) with City of Hope Medical Foundation, practicing in Irvine, California. Their prescriptions cost Medicare Part D more than their services did: $344,520 for 129 claims, against $10,057 paid for services in 2024. Neurocrine Biosciences, Inc. was the largest of 11 companies reporting payments in 2025, $6,189 in all, mostly consulting fees. Lists Hoag Memorial Hospital Presbyterian as a hospital affiliation.
Overview
| NPI | 1902303431 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 11, 2018 |
| Last updated in NPPES | Sep 13, 2024 |
| Certified by provider | Sep 13, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | A195487 | CA |
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 - Medical Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 44 |
|---|---|
| Services billed | 106 across 8 procedure codes |
| Paid by Medicare | $10,057 |
Part D prescriptions in 2024
| Prescriptions (claims) | 129 · 154 30-day fills |
|---|---|
| Patients | 36 |
| Total drug cost | $344,520 |
| Generic share | 68% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Medical Oncology |
| Telehealth | Offers telehealth |
Medical group
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
Hospital affiliation
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
Industry payments (Open Payments)
- 2025$6,189 · 19 payments from 11 companies
- 2024$409.27 · 11 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $4,148 | 2 |
| Janssen Biotech, Inc. | $1,263 | 1 |
| Bayer Healthcare LLC | $149.78 | 1 |
| Teva Pharmaceuticals USA, Inc. | $133.14 | 6 |
| Exelixis Inc. | $116.96 | 3 |
What the 2025 payments were for
- Consulting Fee$5,288 · 2 payments
- Food and Beverage$808.51 · 16 payments
- Entertainment$93.36 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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