Han Tonthat, MD
NPI 1801897335ActiveIndividual· Internal Medicine· Herndon, VA
Internal Medicine (MD) in Herndon, Virginia, licensed in VA, with an NPI issued in August 2005. Their prescriptions cost Medicare Part D more than their services did: $409,915 for 1,448 claims, against $16,456 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 6 companies reporting payments in 2025, $553.66 in all, mostly food and beverage.
Overview
| NPI | 1801897335 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 9, 2005 |
| Last updated in NPPES | Oct 4, 2021 |
| Certified by provider | Oct 4, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 0101056112 | VA |
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 (DC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 47 |
|---|---|
| Services billed | 213 across 7 procedure codes |
| Paid by Medicare | $16,456 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,448 · 3,641 30-day fills |
|---|---|
| Patients | 87 |
| Total drug cost | $409,915 |
| Generic share | 81% of claims |
Education and affiliations
| Graduation year | 1995 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Psychiatry |
| Telehealth | Offers telehealth |
Industry payments (Open Payments)
- 2025$553.66 · 21 payments from 6 companies
- 2024$572.98 · 28 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $207.78 | 7 |
| Amgen Inc. | $159.50 | 7 |
| Bayer Healthcare Pharmaceuticals Inc. | $72.74 | 3 |
| Novo Nordisk Inc | $48.79 | 2 |
| Lilly USA, LLC | $35.48 | 1 |
What the 2025 payments were for
- Food and Beverage$553.66 · 21 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 21 internal medicine physicians in Herndon · All internal medicine physicians in Virginia