VIVIAN NGUYEN MD
NPI 1689869570
Internal Medicine in Westminster, CA
About Vivian Nguyen Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
VIVIAN NGUYEN MD (NPI 1689869570) is an individual internal medicine provider in Westminster, California, licensed in California (A102097) and active in the NPI registry since September 2007. She is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through January 3, 2028, and is a graduate of Other (2004).
NPPES Registry Identity
Specialties & Licenses
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
Vivian 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
7Medicare enrollment records show Vivian Nguyen reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Westminster, CA 92683
- Reassigned Medicare billing, California enrollment
Montebello, CA 90640
- Reassigned Medicare billing, California enrollment
- 962 clinicians in this Medicare group
Chino, CA 91710
- Reassigned Medicare billing, California enrollment
- 145 clinicians in this Medicare group
West Hollywood, CA 90048
- Reassigned Medicare billing, California enrollment
- 175 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 clinicians in this Medicare group
Apple Valley, CA 92307
- Reassigned Medicare billing, California enrollment
- 914 clinicians in this Medicare group
Apple Valley, CA 92307
- Reassigned Medicare billing, California enrollment
- 18 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.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 05D2296741
Vivian Nguyen MD Professional Corp · Westminster, CAAreas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92683 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Vivian Nguyen's NPI number?
The NPI number for Vivian Nguyen is 1689869570. It was assigned to this individual provider in the NPPES registry on September 13, 2007.
Where is Vivian Nguyen located?
Vivian Nguyen practices at 8419 Westminster Blvd, Westminster, CA 92683. The listed phone number is (714) 248-9558.
What is Vivian Nguyen's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Vivian Nguyen enrolled in Medicare?
Yes. Vivian 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 Vivian Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Vivian Nguyen reassigns Medicare benefits to 7 organizations: Vivian Nguyen MD Professional Corp (Westminster, CA), Galen Inpatient Physicians PC (Montebello, CA), Desert Valley Medical Group, Inc (Chino, CA), Kansal Inc (West Hollywood, CA), Inpatient Specialists Of California, PC (San Bernardino, CA) and 2 more organizations, listed in the Medicare section above. 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 Vivian Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Does Vivian Nguyen hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 05D2296741) is associated with this NPI, valid through January 3, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Vivian Nguyen was last updated on May 18, 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.
# Vivian Nguyen, MD · NPI 1689869570
Internal Medicine physician in Westminster, California. Individual provider, active in the CMS NPPES registry since September 13, 2007.
## Identity
- **NPI:** 1689869570 (Entity type: Individual)
- **Enumerated:** September 13, 2007
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A102097 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 8419 WESTMINSTER BLVD, Westminster, CA 92683-3308
- **Phone:** (714) 248-9558 · **Fax:** (714) 248-9740
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): Vivian Nguyen MD Professional Corp (NPI 1033878384, Westminster, CA); Galen Inpatient Physicians PC (NPI 1114703006, Montebello, CA); Desert Valley Medical Group, Inc (NPI 1588246425, Chino, CA); Kansal Inc (NPI 1043510183, West Hollywood, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2004
## Record status
- **NPPES last updated:** May 18, 2023
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1689869570) · Data from the CMS NPPES public registry.