Duke An Michael Phan, MD
NPI 1437352630ActiveIndividual· Psychiatry & Neurology, Neurology· Fountain Valley, CA
Psychiatry & Neurology, Neurology (MD) in Fountain Valley, California, trained at Geisel School of Medicine at Dartmouth (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $223,453 for 1,797 claims, against $95,148 paid for services in 2024. Neurocrine Biosciences, Inc. was the largest of 7 companies reporting payments in 2025, $744.13 in all, mostly food and beverage.
Overview
| NPI | 1437352630 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 6, 2007 |
| Last updated in NPPES | Mar 7, 2023 |
| Certified by provider | Feb 21, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Neurology Primary | 2084N0400X | A51193 | 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 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 - Neurology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 274 |
|---|---|
| Services billed | 1,183 across 18 procedure codes |
| Paid by Medicare | $95,148 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,797 · 2,925 30-day fills |
|---|---|
| Patients | 219 |
| Total drug cost | $223,453 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | Geisel School of Medicine at Dartmouth |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Neurology |
| Telehealth | Offers telehealth |
Hospital affiliation
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$744.13 · 7 payments from 7 companies
- 2024$277.92 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $127.57 | 1 |
| Astrazeneca Pharmaceuticals LP | $123.50 | 1 |
| Alexion Pharmaceuticals, Inc. | $120.19 | 1 |
| Pfizer Inc. | $120.08 | 1 |
| Argenx US, Inc. | $114.98 | 1 |
What the 2025 payments were for
- Food and Beverage$744.13 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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