Nang Lok Ellick Tsang, M.D.
NPI 1992873723ActiveIndividual· Internal Medicine· San Francisco, CA
Internal Medicine (M.D.) in San Francisco, California, licensed in CA, with an NPI issued in December 2006. Their prescriptions cost Medicare Part D more than their services did: $495,789 for 5,863 claims, against $163,313 paid for services in 2024. Novo Nordisk Inc was the largest of 11 companies reporting payments in 2025, $724.87 in all, mostly food and beverage. Lists Ahmc Seton Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1992873723 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Dec 1, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | CA A053928 | CA |
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) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 172 |
|---|---|
| Services billed | 1,434 across 25 procedure codes |
| Paid by Medicare | $163,313 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,863 · 9,448 30-day fills |
|---|---|
| Patients | 312 |
| Total drug cost | $495,789 |
| Generic share | 80% of claims |
Education and affiliations
| Graduation year | 1984 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Ahmc Seton Medical CenterDaly City, CA
- Peninsula Medical CenterBurlingame, CA
Other facilities
- Anx Home HealthcareHome health agency · Burlingame, CA
- Golden Heights HealthcareNursing home · Daly City, CA
- Golden Pavilion HealthcareNursing home · Daly City, CA
- Linda Mar Care CenterNursing home · Pacifica, CA
- Pacifica Nursing and Rehabilitation CenterNursing home · Pacifica, CA
Industry payments (Open Payments)
- 2025$724.87 · 30 payments from 11 companies
- 2024$1,021 · 38 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $179.55 | 8 |
| Astrazeneca Pharmaceuticals LP | $140.77 | 5 |
| Lilly USA, LLC | $97.60 | 4 |
| Merck Sharp & Dohme LLC | $78.66 | 3 |
| E.R. Squibb & Sons, L.L.C. | $61.45 | 3 |
What the 2025 payments were for
- Food and Beverage$724.87 · 30 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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