Brian Leberthon, M.D.
NPI 1326023979 · Hematology & Oncology Physician · West Covina, CA
Enrolled with Medicare as Practitioner - Hematology/Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brian Leberthon, M.D. is a Hematology & Oncology Physician provider in West Covina, CA (NPI 1326023979).
Provider details
- NPI number
- 1326023979
- Entity type
- Individual
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G79934 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
3,880 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 1,080 | $196 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 784 | $35 |
| Infusion Into a Vein for Hydration, Each Additional Hour96361 | 461 | $14 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Each Additional Hour96366 | 421 | $23 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 257 | $16 |
| Infusion Into a Vein for Therapy, Prevention, Or Diagnosis, Additional Sequential Infusion, 1 Hour Or Less |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 82 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 158 | 50 |
| Omeprazole | 106 | 18 |
| Levothyroxine Sodium | 89 | 23 |
| Apixabanbrand: Eliquis | 87 | 17 |
| Amlodipine Besylate | 78 | 16 |
| Anastrozole | 76 | 16 |
| Tamoxifen Citrate | 73 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$6,011 across 235 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-07
- Last updated
- 2016-12-14
Frequently asked questions
- What is Brian Leberthon's NPI number?
- Brian Leberthon's National Provider Identifier (NPI) is 1326023979, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Brian Leberthon's specialty?
- Brian Leberthon is listed in the NPPES registry with a primary specialty of Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Brian Leberthon located?
- Brian Leberthon's practice location on file with NPPES is 1135 S Sunset Ave, West Covina, CA 91790-3937.
- What is Brian Leberthon's phone number?
- The practice phone number listed in the NPPES registry for Brian Leberthon is (626) 338-9560.
- Does Brian Leberthon accept Medicare?
- Brian Leberthon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Brian Leberthon's NPI active?
- Yes — Brian Leberthon's NPI (1326023979) is active in the NPPES registry as of the last update on 2016-12-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.