Derek Duy Mai, M.D.
NPI 1386051423ActiveIndividual· Ophthalmology· Mission Hills, CA
Ophthalmology (M.D.) in Mission Hills, California, trained at University of California, San Diego School of Medicine (class of 2014). Their prescriptions cost Medicare Part D more than their services did: $130,650 for 3,267 claims, against $74,497 paid for services in 2024. Apellis Pharmaceuticals, Inc. reported $47.82 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1386051423 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jul 21, 2014 |
| Last updated in NPPES | Oct 22, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | A141400 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Ophthalmology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 211 |
|---|---|
| Services billed | 711 across 42 procedure codes |
| Paid by Medicare | $74,497 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,267 · 5,730 30-day fills |
|---|---|
| Patients | 799 |
| Total drug cost | $130,650 |
| Generic share | 62% of claims |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Ophthalmology |
Medical group
- Providence Facey Medical FoundationValencia, CA · 385 clinicians
Industry payments (Open Payments)
- 2025$47.82 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Apellis Pharmaceuticals, Inc. | $47.82 | 1 |
What the 2025 payments were for
- Food and Beverage$47.82 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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