Tan Khac Nguyen, M.D.
NPI 1144273491ActiveIndividual· Dermatology, Procedural Dermatology· Upland, CA
Dermatology, Procedural Dermatology (M.D.) with Department of State Hospitals and 1 other group, practicing in Upland, California. In 2024 Medicare paid $1,033,952 for 309 patients, and Part D covered 662 of their prescriptions, 82% of them generic. Abbvie Inc. was the largest of 12 companies reporting payments in 2025, $1,533 in all, mostly food and beverage. Lists San Antonio Regional Hospital as a hospital affiliation.
Overview
| NPI | 1144273491 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 18, 2006 |
| Last updated in NPPES | Aug 8, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology, Procedural Dermatology Primary | 207NS0135X | A70331 | CA |
| Dermatology | 207N00000X | A70331 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 309 |
|---|---|
| Services billed | 45,981 across 84 procedure codes |
| Paid by Medicare | $1,033,952 |
Part D prescriptions in 2024
| Prescriptions (claims) | 662 · 801 30-day fills |
|---|---|
| Patients | 147 |
| Total drug cost | $653,456 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 1991 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical groups
- Department of State HospitalsNapa, CA · 270 clinicians
- Advanced Skin Clinic and Surgery PCUpland, CA · 2 clinicians
Hospital affiliation
- San Antonio Regional HospitalUpland, CA
Industry payments (Open Payments)
- 2025$1,533 · 65 payments from 12 companies
- 2024$1,324 · 65 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $375.02 | 22 |
| Pfizer Inc. | $226.25 | 9 |
| Leo Pharma Inc. | $187.12 | 9 |
| Janssen Biotech, Inc. | $156.94 | 5 |
| Biofrontera Inc. | $147.00 | 5 |
What the 2025 payments were for
- Food and Beverage$1,414 · 62 payments
- Education$118.81 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Dermatology, Procedural Dermatology providers in Upland
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