LOC NGUYEN MD
NPI 1104026509
Anesthesiology in Fontana, CA
About Loc Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
LOC NGUYEN MD (NPI 1104026509) is an individual anesthesiology provider in Fontana, California, licensed in California (A94850) and active in the NPI registry since July 2007. He is enrolled in Medicare PECOS and is a graduate of Other (2003).
NPPES Registry Identity
Specialties & Licenses 2
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
Loc Nguyen Md 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 Reassignments
2Medicare enrollment records show Loc Nguyen reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fontana, CA 92335
- Reassigned Medicare billing, California enrollment
- 5,228 clinicians in this Medicare group
Fountain Valley, CA 97208
- Reassigned Medicare billing, California enrollment
- 59 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.
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.
FONTANA, CA 92335
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 Loc Nguyen's NPI number?
The NPI number for Loc Nguyen is 1104026509. It was assigned to this individual provider in the NPPES registry on July 23, 2007.
Where is Loc Nguyen located?
Loc Nguyen practices at 9961 Sierra Ave Department Of Anesthesia, Fontana, CA 92335. The listed phone number is (602) 615-9226.
What is Loc Nguyen's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Loc Nguyen enrolled in Medicare?
Yes. Loc Nguyen 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 organizations bill Medicare for Loc Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Loc Nguyen reassigns Medicare benefits to 2 organizations: Southern California Permanente Medical Group (Fontana, CA) and Premiercare Anesthesia Fountain Valley Inc (Fountain Valley, CA). Each 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 Loc Nguyen'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 Loc Nguyen was last updated on November 29, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Loc Nguyen, MD · NPI 1104026509
Anesthesiology physician in Fontana, California. Individual provider, active in the CMS NPPES registry since July 23, 2007.
## Identity
- **NPI:** 1104026509 (Entity type: Individual)
- **Enumerated:** July 23, 2007
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** A94850 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 9961 SIERRA AVE, DEPARTMENT OF ANESTHESIA, Fontana, CA 92335-6720
- **Phone:** (602) 615-9226
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Southern California Permanente Medical Group (NPI 1689606196, Fontana, CA); Premiercare Anesthesia Fountain Valley Inc (NPI 1831536531, Fountain Valley, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2003
## Record status
- **NPPES last updated:** November 29, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1104026509) · Data from the CMS NPPES public registry.