Brian J. Leberthon, MD., a Medical
NPI 1821202060 · Hematology & Oncology Physician · West Covina, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Brian J. Leberthon, MD., a Medical is a Hematology & Oncology Physician organization in West Covina, CA (NPI 1821202060).
Provider details
- NPI number
- 1821202060
- Entity type
- Organization
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Brian Leberthon, M.D. , President of Corp.(626) 338-9560
- 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 tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-05-09
- Last updated
- 2010-12-13
Frequently asked questions
- What is Brian J. Leberthon, MD., a Medical's NPI number?
- Brian J. Leberthon, MD., a Medical's National Provider Identifier (NPI) is 1821202060, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Brian J. Leberthon, MD., a Medical?
- Brian J. Leberthon, MD., a Medical is classified in the NPPES registry as Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Brian J. Leberthon, MD., a Medical located?
- Brian J. Leberthon, MD., a Medical's practice location on file with NPPES is 1135 S Sunset Ave, West Covina, CA 91790-3937.
- What is Brian J. Leberthon, MD., a Medical's phone number?
- The practice phone number listed in the NPPES registry for Brian J. Leberthon, MD., a Medical is (626) 338-9560.
- Does Brian J. Leberthon, MD., a Medical accept Medicare?
- Brian J. Leberthon, MD., a Medical is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for Brian J. Leberthon, MD., a Medical?
- The authorized official listed on Brian J. Leberthon, MD., a Medical's NPPES record is Brian Leberthon, M.D. , President of Corp.. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Brian J. Leberthon, MD., a Medical's NPI active?
- Yes — Brian J. Leberthon, MD., a Medical's NPI (1821202060) is active in the NPPES registry as of the last update on 2010-12-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.