Leoncio Ramon Diaz, M.D.
Pulmonary Disease Physician · Los Angeles, CA
Leoncio Ramon Diaz, M.D. is a pulmonary disease physician with a practice address in Los Angeles, California, and NPI 1609511161, issued on Apr 29, 2022. Check the license (California 202419, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Leoncio Ramon Diaz
- Credential
- M.D.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- 202419 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2020 Zonal Ave # Ird720, Los Angeles, CA 90089
- Phone
- (323) 226-7923
- Enumerated
- Apr 29, 2022
- Record last updated
- Sep 11, 2025
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 1,443 in California → Look up another NPI →
Also registered at 2020 Zonal Ave # Ird720
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Codie Lavoie, MD, FRCPCStudent in an Organized Health Care Education/Training Program1891679478
- Katherine Leger, MDInternal Medicine Physician1841796539
Verify Leoncio Ramon Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 202419Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average pulmonary disease physician in 2024
74 Medicare Part D claims for 35 beneficiaries, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Leoncio Ramon Diaz among 1,443 pulmonary disease physician records in California
Leoncio Ramon Diaz, M.D. is one of 1,443 pulmonary disease physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than over 99% of them.
- NPI issued2022 · over 99% of these records are older, under 1% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2025 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in California
There are 1,443 pulmonary disease physician records in California.
All 1,443 in California → Every provider in Los Angeles → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Joon Young Choi, MDLos Angeles, CA 900891629519889
- Shishir RaoLos Angeles, CA 900891942707880
- Nilo Arnaiz, MDLos Angeles, CA 900951386678498
- John Belperio, MDLos Angeles, CA 900951285659482
- Christopher Cooper, MDLos Angeles, CA 900951588680482
- Steven Dubinett, M.D.Los Angeles, CA 900951144255878
- Tomas Ganz, MDLos Angeles, CA 900951083639264
- Michael Keane, MDLos Angeles, CA 900951124047600
Common questions
What is Leoncio Ramon Diaz, M.D.'s NPI number?
Leoncio Ramon Diaz, M.D.'s National Provider Identifier (NPI) is 1609511161, issued on Apr 29, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Leoncio Ramon Diaz, M.D. located?
The NPPES record lists a practice address at 2020 Zonal Ave # Ird720, Los Angeles, CA, 90089. Phone: (323) 226-7923. Providers update this record themselves, so call before visiting.
How can I verify Leoncio Ramon Diaz, M.D.'s license?
NPPES lists California license number 202419, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Leoncio Ramon Diaz, M.D. prescribe under Medicare Part D?
In 2024, Leoncio Ramon Diaz, M.D. had 74 Medicare Part D claims for 35 beneficiaries; the average among pulmonary disease physician prescribers was 1,425. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.