DR. ROGER L. NGUYEN, A CORPORATION
NPI 1184141566
Allergy & Immunology - Allergy in Garden Grove, CA
About Dr. Roger L. Nguyen, A Corporation NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ROGER L. NGUYEN, A CORPORATION (NPI 1184141566) is a healthcare organization registered as an allergy in Garden Grove, California and active in the NPI registry since August 2017. The organization lists Roger Nguyen, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Roger L. Nguyen, A Corporation is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
Medicare enrollment records show 1 clinician reassigns Medicare billing to Dr. Roger L. Nguyen, A Corporation, which bills Medicare for the services this clinician delivers.
Clinician (1)
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 Dr. Roger L. Nguyen, A Corporation's NPI number?
The NPI number for Dr. Roger L. Nguyen, A Corporation is 1184141566. It was assigned to this organization in the NPPES registry on August 25, 2017.
Where is Dr. Roger L. Nguyen, A Corporation located?
Dr. Roger L. Nguyen, A Corporation is located at 9746 Westminster Ave Ste A, Garden Grove, CA 92844. The listed phone number is (714) 638-4433.
What is Dr. Roger L. Nguyen, A Corporation's specialty?
The primary specialty registered for this NPI is Allergy & Immunology, specializing in Allergy, with taxonomy code 207KA0200X.
Is Dr. Roger L. Nguyen, A Corporation enrolled in Medicare?
Yes. Dr. Roger L. Nguyen, A Corporation is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Dr. Roger L. Nguyen, A Corporation?
According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Allergy/Immunology) reassigns their Medicare billing to Dr. Roger L. Nguyen, A Corporation. 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 Dr. Roger L. Nguyen, A Corporation was last updated on August 25, 2017. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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. Roger L. Nguyen, A Corporation · NPI 1184141566
Allergy organization in Garden Grove, California. Organization record, active in the CMS NPPES registry since August 25, 2017.
## Identity
- **NPI:** 1184141566 (Entity type: Organization)
- **Enumerated:** August 25, 2017
- **Primary specialty:** Allergy & Immunology - Allergy · taxonomy 207KA0200X
- **Organization subpart:** No
- **Authorized official:** Roger Nguyen, OWNER
## Practice location
- **Address:** 9746 WESTMINSTER AVE STE A, Garden Grove, CA 92844-2984
- **Phone:** (714) 638-4433
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 1 clinician (Allergy/Immunology) reassigns Medicare billing to this organization (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** August 25, 2017
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Source: [NPI Profile](https://npiprofile.com/npi/1184141566) · Data from the CMS NPPES public registry.