Derek T. Phan, M.D.
NPI 1073729588ActiveIndividual· Internal Medicine· Westminster, CA
Internal Medicine (M.D.) in Westminster, California, trained at New York Medical College (class of 2005). Part D covered 4,198 prescriptions written in 2024, 85% of them generic. Lilly USA, LLC was the largest of 2 companies reporting payments in 2025, $40.76 in all, mostly food and beverage.
Overview
| NPI | 1073729588 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 14, 2007 |
| Last updated in NPPES | Oct 7, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A99908 | 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 - Internal Medicine (CA) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 4,198 · 9,453 30-day fills |
|---|---|
| Patients | 238 |
| Total drug cost | $560,664 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | New York Medical College |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Internal Medicine |
Industry payments (Open Payments)
- 2025$40.76 · 2 payments from 2 companies
- 2024$25.17 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $21.27 | 1 |
| Exact Sciences Corporation | $19.49 | 1 |
What the 2025 payments were for
- Food and Beverage$40.76 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 74 internal medicine physicians in Westminster · All internal medicine physicians in California