BRIAN J. LEBERTHON, MD., A MEDICAL
NPI 1821202060
Internal Medicine - Hematology & Oncology in West Covina, CA
About Brian J. Leberthon, Md., A Medical NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
BRIAN J. LEBERTHON, MD., A MEDICAL (NPI 1821202060) is a healthcare organization registered as a hematology & oncology in West Covina, California and active in the NPI registry since May 2007. The organization lists Brian John Leberthon, M.d. , President Of Corp., as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Brian J. Leberthon, Md., A Medical is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by March 31, 2027
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Brian J. Leberthon, MD., A Medical, which bills Medicare for the services this clinician delivers.
Clinician (1)
West Covina, CA 91790
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Brian J. Leberthon, MD., A Medical's NPI number?
The NPI number for Brian J. Leberthon, MD., A Medical is 1821202060. It was assigned to this organization in the NPPES registry on May 9, 2007.
Where is Brian J. Leberthon, MD., A Medical located?
Brian J. Leberthon, MD., A Medical is located at 1135 S Sunset Ave Suite 207, West Covina, CA 91790. The listed phone number is (626) 338-9560.
What is Brian J. Leberthon, MD., A Medical's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.
Is Brian J. Leberthon, MD., A Medical enrolled in Medicare?
Yes. Brian J. Leberthon, MD., A Medical is registered in the Medicare PECOS enrollment system.
When is Brian J. Leberthon, MD., A Medical's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by March 31, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through Brian J. Leberthon, MD., A Medical?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Hematology/Oncology) reassigns their Medicare billing to Brian J. Leberthon, MD., A Medical. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Brian J. Leberthon, MD., A Medical was last updated on December 13, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Brian J. Leberthon, Md., A Medical · NPI 1821202060
Hematology & Oncology organization in West Covina, California. Organization record, active in the CMS NPPES registry since May 9, 2007.
## Identity
- **NPI:** 1821202060 (Entity type: Organization)
- **Enumerated:** May 9, 2007
- **Primary specialty:** Internal Medicine - Hematology & Oncology · taxonomy 207RH0003X
- **Organization subpart:** No
- **Authorized official:** Brian Leberthon, M.D. , PRESIDENT OF CORP.
## Practice location
- **Address:** 1135 S SUNSET AVE, SUITE 207, West Covina, CA 91790-3937
- **Phone:** (626) 338-9560 · **Fax:** (626) 338-9360
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** March 31, 2027 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 1 clinician (Hematology/Oncology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** December 13, 2010
- **Other identifiers:** Medicare UPIN G98159 (CA); Medicare PIN WG79934D (CA); Medicaid 00G799340 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1821202060) · Data from the CMS NPPES public registry.