Gilmer John Youn, M.D.
Infectious Disease Physician · Los Angeles, CA
Gilmer John Youn, M.D. is an infectious disease physician with a practice address in Los Angeles, California, and NPI 1336477926, issued on Nov 19, 2009. Check the license (California A110078, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gilmer John Youn
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A110078 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5427 Whittier Blvd, Los Angeles, CA 90022
- Phone
- (323) 869-5448
- Enumerated
- Nov 19, 2009
- Record last updated
- Sep 26, 2023
- Fax
- (323) 869-5427
- Medicare enrollment
- Enrolled (PECOS I20120808000758); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 2008
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 5427 Whittier Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Catherine Aquino, FNPObstetrics & Gynecology Nurse Practitioner1558594911
- Jon AyalaMental Health Counselor1174347405
- Shahryar Balakhani, D.O.Family Medicine Physician1699052548
- Alonso Bautista, MFTIMarriage & Family Therapist1689005431
- Marivic Bautista, MDAdult Medicine Physician1760680243
- Ana Bevilacquac, CNACase Manager/Care Coordinator1316093735
Verify Gilmer John Youn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A110078Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average infectious disease physician in 2024
290 Medicare Part D claims for 90 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Biktarvy48 claims
- Fluconazole25 claims
- Triumeq21 claims
- Valganciclovir Hcl15 claims
- Ciprofloxacin Hcl14 claims
- Fosfomycin Tromethamine13 claims
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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupBellflower, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gilmer John Youn among 1,119 infectious disease physician records in California
Gilmer John Youn, M.D. is one of 1,119 infectious disease physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 66% of them.
- NPI issued2009 · 66% of these records are older, 31% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2008 · median 2003 among the 735 with a school on file
- Record last updated2023 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Los Angeles → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Zin Oo, M.D.Los Angles, CA 900221265744999
- Minji KimLos Angeles, CA 900241265181853
- Drew Winston, MDLos Angeles, CA 900241265655203
- Steven Hwang, M.D.Los Angeles, CA 900191235334749
- David Rhew, M.D.Los Angeles, CA 900191992900815
- Jessica Costales-Cantrell, DOLos Angeles, CA 900271063948537
- Jacob Fleischmann, M.D.Los Angeles, CA 900271376563296
- Jong Huang, M.D.Los Angeles, CA 900171235233461
Common questions
What is Gilmer John Youn, M.D.'s NPI number?
Gilmer John Youn, M.D.'s National Provider Identifier (NPI) is 1336477926, issued on Nov 19, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Gilmer John Youn, M.D. located?
The NPPES record lists a practice address at 5427 Whittier Blvd, Los Angeles, CA, 90022. Phone: (323) 869-5448. Providers update this record themselves, so call before visiting.
How can I verify Gilmer John Youn, M.D.'s license?
NPPES lists California license number A110078, 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 Gilmer John Youn, M.D. prescribe under Medicare Part D?
In 2024, Gilmer John Youn, M.D. had 290 Medicare Part D claims for 90 beneficiaries; the average among infectious disease physician prescribers was 689. 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.