Mary K. Leung, MD
NPI 1023278306ActiveIndividual· Internal Medicine· Rockville Centre, NY
Internal Medicine (MD) in Rockville Centre, New York, trained at State University of New York at Buffalo School of Medicine (class of 2004). Their prescriptions cost Medicare Part D more than their services did: $2,059,601 for 588 claims, against $617,554 paid for services in 2024. Novartis Pharmaceuticals Corporation was the largest of 9 companies reporting payments in 2025, $536.65 in all, mostly food and beverage.
Overview
| NPI | 1023278306 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 11, 2008 |
| Last updated in NPPES | Mar 9, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 245464 | NY |
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 - Hematology/Oncology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 609 |
|---|---|
| Services billed | 67,519 across 41 procedure codes |
| Paid by Medicare | $617,554 |
Part D prescriptions in 2024
| Prescriptions (claims) | 588 · 1,146 30-day fills |
|---|---|
| Patients | 128 |
| Total drug cost | $2,059,601 |
| Generic share | 68% of claims |
Education and affiliations
| Medical school | State University of New York at Buffalo School of Medicine |
|---|---|
| Graduation year | 2004 |
| Medicare specialty | Hematology/Oncology |
Medical groups
- North Shore Medical Group of the Mount Sinai School of MedicineBrooklyn, NY · 331 clinicians
- Mount Sinai School of MedicineOceanside, NY · 148 clinicians
Hospital affiliations
- Mount Sinai HospitalNew York, NY
- Mount Sinai South NassauOceanside, NY
Industry payments (Open Payments)
- 2025$536.65 · 22 payments from 9 companies
- 2024$687.80 · 31 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novartis Pharmaceuticals Corporation | $179.45 | 8 |
| Abbvie Inc. | $86.51 | 3 |
| Menarini Silicon Biosystems, Inc. | $64.21 | 2 |
| Merck Sharp & Dohme LLC | $61.10 | 2 |
| Pfizer Inc. | $43.91 | 2 |
What the 2025 payments were for
- Food and Beverage$536.65 · 22 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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