Kathy Diep Ngoc Tieu, M.D.
NPI 1811973951ActiveIndividual· Dermatology· Fairfax, VA
Dermatology (M.D.) in Fairfax, Virginia, trained at University of Virginia School of Medicine (class of 2002). In 2024 Medicare paid $249,537 for 947 patients, and Part D covered 839 of their prescriptions, 89% of them generic. Pfizer Inc. was the largest of 5 companies reporting payments in 2025, $229.83 in all, mostly food and beverage.
Overview
| NPI | 1811973951 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Dec 20, 2005 |
| Last updated in NPPES | Feb 15, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | 0101235150 | VA |
| General Practice | 208D00000X | 0101235150 | 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 - Dermatology (DC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 947 |
|---|---|
| Services billed | 4,624 across 40 procedure codes |
| Paid by Medicare | $249,537 |
Part D prescriptions in 2024
| Prescriptions (claims) | 839 · 1,126 30-day fills |
|---|---|
| Patients | 283 |
| Total drug cost | $286,322 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of Virginia School of Medicine |
|---|---|
| Graduation year | 2002 |
| Medicare specialty | Dermatology |
Medical group
- The Clinical Skin Center of Northern Virginia PLLCFairfax, VA · 6 clinicians
Industry payments (Open Payments)
- 2025$229.83 · 6 payments from 5 companies
- 2024$219.29 · 6 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $125.00 | 1 |
| Leo Pharma Inc. | $51.62 | 2 |
| Amgen Inc. | $21.31 | 1 |
| Lilly USA, LLC | $17.15 | 1 |
| E.R. Squibb & Sons, L.L.C. | $14.75 | 1 |
What the 2025 payments were for
- Food and Beverage$229.83 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 44 dermatologists in Fairfax · All dermatologists in Virginia