Alexander Nguyen Castillo, MD
NPI 1164059226ActiveIndividual· Internal Medicine· Henderson, NV
Internal Medicine (MD) with Ferdowsian, Global Services PLLC, practicing in Henderson, Nevada. Their prescriptions cost Medicare Part D more than their services did: $105,199 for 352 claims, against $54,290 paid for services in 2024. Abbvie Inc. was the largest of 7 companies reporting payments in 2025, $670.19 in all, mostly food and beverage.
Overview
| NPI | 1164059226 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 26, 2020 |
| Last updated in NPPES | Aug 14, 2026 |
| Certified by provider | Aug 14, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 24010 | NV |
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); Practitioner - Internal Medicine (NV) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 289 |
|---|---|
| Services billed | 672 across 22 procedure codes |
| Paid by Medicare | $54,290 |
Part D prescriptions in 2024
| Prescriptions (claims) | 352 · 614 30-day fills |
|---|---|
| Patients | 98 |
| Total drug cost | $105,199 |
| Generic share | 79% of claims |
Education and affiliations
| Graduation year | 2020 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Ferdowsian, Global Services PLLCHenderson, NV · 8 clinicians
Industry payments (Open Payments)
- 2025$670.19 · 30 payments from 7 companies
- 2024$624.55 · 18 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $241.50 | 7 |
| Novo Nordisk Inc | $149.34 | 7 |
| Lilly USA, LLC | $106.00 | 8 |
| Astrazeneca Pharmaceuticals LP | $69.56 | 3 |
| Exact Sciences Corporation | $49.68 | 3 |
What the 2025 payments were for
- Food and Beverage$670.19 · 30 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 260 internal medicine physicians in Henderson · All internal medicine physicians in Nevada