DR. GILMER JOHN YOUN M.D.
NPI 1336477926
Internal Medicine - Infectious Disease in Los Angeles, CA
About Dr. Gilmer John Youn M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GILMER JOHN YOUN M.D. (NPI 1336477926) is an individual infectious disease provider in Los Angeles, California, licensed in California (A110078) and active in the NPI registry since November 2009. He is enrolled in Medicare PECOS and is a graduate of University Of California, San Diego School Of Medicine (2008).
NPPES Registry Identity
Specialties & Licenses 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Gilmer John Youn M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Gilmer Youn reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Pico Rivera, CA 90660
- Reassigned Medicare billing, California enrollment
- 13,921 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90022 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
E. LOS ANGELES, CA 90022
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 Gilmer Youn's NPI number?
The NPI number for Gilmer Youn is 1336477926. It was assigned to this individual provider in the NPPES registry on November 19, 2009.
Where is Gilmer Youn located?
Gilmer Youn practices at 5427 Whittier Blvd, Los Angeles, CA 90022. The listed phone number is (323) 869-5448.
What is Gilmer Youn's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.
Is Gilmer Youn enrolled in Medicare?
Yes. Gilmer Youn is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Gilmer Youn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gilmer Youn reassigns Medicare benefits to Southern California Permanente Medical Group (Pico Rivera, CA). The 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 Gilmer Youn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Gilmer Youn was last updated on September 26, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Gilmer John Youn, M.D. · NPI 1336477926
Infectious Disease physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since November 19, 2009.
## Identity
- **NPI:** 1336477926 (Entity type: Individual)
- **Enumerated:** November 19, 2009
- **Primary specialty:** Internal Medicine - Infectious Disease · taxonomy 207RI0200X
- **State license:** A110078 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 5427 WHITTIER BLVD, Los Angeles, CA 90022-4101
- **Phone:** (323) 869-5448 · **Fax:** (323) 869-5427
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Southern California Permanente Medical Group (NPI 1891287827, Pico Rivera, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Diego School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** September 26, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1336477926) · Data from the CMS NPPES public registry.