Brian J. Leberthon, M.D.
NPI 1326023979ActiveIndividual· Internal Medicine, Hematology & Oncology· West Covina, CA
Internal Medicine, Hematology & Oncology (M.D.) in West Covina, California, trained at University of Southern California Keck School of Medicine (class of 1993). Their prescriptions cost Medicare Part D more than their services did: $3,566,148 for 3,059 claims, against $1,335,122 paid for services in 2024. Janssen Biotech, Inc. was the largest of 49 companies reporting payments in 2025, $6,218 in all, mostly food and beverage.
Overview
| NPI | 1326023979 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Dec 7, 2005 |
| Last updated in NPPES | Dec 14, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | G79934 | 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 - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 236 |
|---|---|
| Services billed | 83,885 across 87 procedure codes |
| Paid by Medicare | $1,335,122 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,059 · 4,136 30-day fills |
|---|---|
| Patients | 233 |
| Total drug cost | $3,566,148 |
| Generic share | 77% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
Hospital affiliations
- Emanate Health Foothill Presbyterian HospitalGlendora, CA
- Emanate Health Inter-Community HospitalCovina, CA
- Pomona Valley Hospital Medical CenterPomona, CA
- Usc Arcadia HospitalArcadia, CA
Other facilities
- Med Care Plus Home Health IncHome health agency · Pasadena, CA
Industry payments (Open Payments)
- 2025$6,218 · 281 payments from 49 companies
- 2024$6,011 · 251 payments from 46 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $970.26 | 38 |
| Astrazeneca Pharmaceuticals LP | $838.60 | 50 |
| Pfizer Inc. | $305.47 | 19 |
| Incyte Corporation | $296.61 | 12 |
| Novartis Pharmaceuticals Corporation | $251.73 | 12 |
What the 2025 payments were for
- Food and Beverage$5,973 · 277 payments
- Education$244.69 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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