VIET SEAN NGUYEN MD
NPI 1902556855
General Practice in Riverside, CA
About Viet Sean Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
VIET SEAN NGUYEN MD (NPI 1902556855) is an individual general practice provider in Riverside, California, licensed in California (A189934) and active in the NPI registry since March 2022. He is enrolled in Medicare PECOS and is a graduate of Univ Of Central Florida, College Of Medicine (2022).
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
Viet Sean 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
3Medicare enrollment records show Viet Nguyen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Riverside, CA 92501
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1740235258 (California)
- 2,323 clinicians in this Medicare group
Fontana, CA 92336
- Reassigned Medicare billing, California enrollment
- 95 clinicians in this Medicare group
Upland, CA 91786
- Reassigned Medicare billing, California enrollment
- 103 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.
RIVERSIDE, CA 92501
RIVERSIDE, CA 92501
RIVERSIDE, CA 92501
RIVERSIDE, CA 92501
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 Viet Nguyen's NPI number?
The NPI number for Viet Nguyen is 1902556855. It was assigned to this individual provider in the NPPES registry on March 24, 2022.
Where is Viet Nguyen located?
Viet Nguyen practices at 4445 Magnolia Ave, Riverside, CA 92501. The listed phone number is (951) 788-3000.
What is Viet Nguyen's specialty?
The primary specialty registered for this NPI is General Practice with taxonomy code 208D00000X.
Is Viet Nguyen enrolled in Medicare?
Yes. Viet 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 Viet Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Viet Nguyen reassigns Medicare benefits to 3 organizations: Cep America - California (Riverside, CA), Mountain View Urgent Care Group, Inc (Fontana, CA) and Mountain View Emergency Physicians Medical Group, Inc. (Upland, 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 Viet 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 Viet Nguyen was last updated on July 28, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 months 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.
# Viet Sean Nguyen, MD · NPI 1902556855
General Practice physician in Riverside, California. Individual provider, active in the CMS NPPES registry since March 24, 2022.
## Identity
- **NPI:** 1902556855 (Entity type: Individual)
- **Enumerated:** March 24, 2022
- **Primary specialty:** General Practice · taxonomy 208D00000X
- **State license:** A189934 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 4445 MAGNOLIA AVE, Riverside, CA 92501-4135
- **Phone:** (951) 788-3000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1386750578, Riverside, CA); Mountain View Urgent Care Group, Inc (NPI 1023306784, Fontana, CA); Mountain View Emergency Physicians Medical Group, Inc. (NPI 1619923653, Upland, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Univ Of Central Florida, College Of Medicine, class of 2022
## Record status
- **NPPES last updated:** July 28, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1902556855) · Data from the CMS NPPES public registry.