Nikki Kwoksam Duong, MD
NPI 1164884284ActiveIndividual· Internal Medicine, Hepatology· Palo Alto, CA
Internal Medicine, Hepatology (MD) in Palo Alto, California, trained at George Washington University School of Medicine (class of 2016). Their prescriptions cost Medicare Part D more than their services did: $140,368 for 185 claims, against $59,758 paid for services in 2024. Ardelyx, Inc. was the largest of 2 companies reporting payments in 2025, $3,426 in all, mostly speaking and faculty fees.
Overview
| NPI | 1164884284 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Mar 28, 2016 |
| Last updated in NPPES | Sep 3, 2026 |
| Certified by provider | Sep 3, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hepatology Primary | 207RI0008X | A192254 | CA |
| Internal Medicine, Gastroenterology | 207RG0100X | A192254 | CA |
| Internal Medicine, Transplant Hepatology | 207RT0003X | A192254 | CA |
| Internal Medicine | 207R00000X | A192254 | CA |
| Hospitalist | 208M00000X | MD045392 | DC |
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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 240 |
|---|---|
| Services billed | 516 across 28 procedure codes |
| Paid by Medicare | $59,758 |
Part D prescriptions in 2024
| Prescriptions (claims) | 185 · 246 30-day fills |
|---|---|
| Patients | 79 |
| Total drug cost | $140,368 |
| Generic share | 67% of claims |
Education and affiliations
| Medical school | George Washington University School of Medicine |
|---|---|
| Graduation year | 2016 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliations
- Stanford Health CareStanford, CA
- Stanford Health Care Tri-ValleyPleasanton, CA
Industry payments (Open Payments)
- 2025$3,426 · 2 payments from 2 companies
- 2024$1,619 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $3,375 | 1 |
| Janssen Biotech, Inc. | $50.86 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$3,375 · 1 payment
- Food and Beverage$50.86 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hepatology providers in Palo Alto
- 1265692180
- 1144378597