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VIVIAN NGUYEN MD
NPI 1689869570
Internal Medicine in Westminster, CA

Active since September 13, 2007PECOS EnrolledAccepts Medicare AssignmentCLIA 05D2296741 · Waiver
8419 WESTMINSTER BLVD, WESTMINSTER, CA 92683(714) 248-9558(714) 248-9740 Get Directions Write a Review

NPPES record last updated: May 18, 2023. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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

NPI1689869570
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameVIVIAN NGUYENCredential: MD
Location Address8419 WESTMINSTER BLVDWestminster, CA 92683-3308
Mailing Address8419 Westminster BlvdWestminster, CA 92683-3308 · (714) 248-9558 · Fax (714) 248-9740
Phone(714) 248-9558
Fax(714) 248-9740
Sole ProprietorNo
Medical School CMSOtherGraduated 2004
Enumeration DateSeptember 13, 2007
Last NPPES UpdateMay 18, 2023
NPPES CertifiedMay 18, 2023
✔ NPI 1689869570 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
Licenses✔ Licensed in CA · A102097✔ Licensed in NY · 249741✔ Licensed in GA · TL001670
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
8419 WESTMINSTER BLVD, Westminster, CA 92683
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

PECOS PAC ID9739247057
PECOS Enrollment IDI20081015000172
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

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, CA
Active · expires Jan 3, 2028
CLIA Number05D2296741
Laboratory TypePhysician Office
Certificate Effective DateJanuary 4, 2026
Certificate Expiration DateJanuary 3, 2028
Laboratory DirectorVivian Nguyen
Laboratory Phone(714) 248-9558
Laboratory LocationVivian Nguyen MD Professional Corp8419 Westminster Blvd, Westminster, CA 92683
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Areas 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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
1,105 services270 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
124 services115 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
50 services23 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
43 services40 patients
New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205
This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.
19 services19 patients

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.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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

Care Plan
Percentage of patients aged 65 years and older who have an advance care plan or surrogate decision maker documented in the medical record that an advance care plan was discussed but the patient did not wish or was not able to name a surrogate decision maker…
95%138 patients4/55-star benchmark: 100%
Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

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.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier21 claims21 services$12.84 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers30 claims30 services$60.54 avg. paid by Medicare
Portable gaseous oxygen system, rental; home compressor used to fill portable oxygen cylinders; includes portable containers, regulator, flowmeter, humidifier, cannula or mask, and tubing K0738
DME-Oxygen and Supplies · category DC000N
1 supplier12 claims12 services$32.54 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

VIVIAN NGUYEN MD PROFESSIONAL CORP
Internal Medicine
8419 WESTMINSTER BLVD
WESTMINSTER, CA 92683
Orange County (714) 403-9748

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.

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.