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LOUIS TOAN THIEN NGUYEN
NPI 1528646544
Emergency Medicine in Los Angeles, CA

Active since March 31, 2021PECOS Enrolled
1200 N STATE ST STE A7D, LOS ANGELES, CA 90089(323) 409-7053 Get Directions Write a Review

NPPES record last updated: February 21, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Feb 21, 2025, Mar 31, 2021 (2 updates tracked since 2021).

About Louis Toan Thien Nguyen NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

LOUIS TOAN THIEN NGUYEN (NPI 1528646544) is an individual emergency medicine provider in Los Angeles, California, licensed in California (A197655) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1528646544
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameLOUIS TOAN THIEN NGUYEN
Location Address1200 N STATE ST STE A7DLos Angeles, CA 90089-1001
Mailing Address1200 N State St Ste A7dLos Angeles, CA 90089-1001 · (323) 409-7053
Phone(323) 409-7053
Sole ProprietorNo
Enumeration DateMarch 31, 2021
Last NPPES UpdateFebruary 21, 20252 updates tracked since enumeration
NPPES CertifiedFebruary 21, 2025
✔ NPI 1528646544 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · A197655
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1200 N STATE ST STE A7D, Los Angeles, CA 90089
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Louis Toan Thien Nguyen is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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.

Medicare Billing Reassignment

Medicare enrollment records show Louis Nguyen reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Continuem
15 mi
Urgent Care
6430 SOUTH ST
Lakewood, CA 90713
  • Reassigned Medicare billing, California enrollment
  • 33 clinicians in this Medicare group
NPI 1336716489 (310) 210-8895

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90089 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
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.

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.

DR. ISHANI D PREMARATNE MD
Plastic Surgery
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-6225
DIVYA MULCHANDANI MD
Student in an Organized Health Care Education/Training Program
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-5707
YEKTA RAHIMI ASHTIANI MD
Student in an Organized Health Care Education/Training Program
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-7556
DAVID VASCONCELLOS
Student in an Organized Health Care Education/Training Program
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-7556
CATHERINE POTIN
Student in an Organized Health Care Education/Training Program
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-7556
JUSTIN VU
Student in an Organized Health Care Education/Training Program
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-7556
ASHLEY KWON
Student in an Organized Health Care Education/Training Program
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-7556
PRANAV BHAMIDIPATI
Student in an Organized Health Care Education/Training Program
1200 N STATE ST STE A7D
LOS ANGELES, CA 90089
Los Angeles County (323) 409-7556

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 Louis Nguyen's NPI number?

The NPI number for Louis Nguyen is 1528646544. It was assigned to this individual provider in the NPPES registry on March 31, 2021.

Where is Louis Nguyen located?

Louis Nguyen practices at 1200 N State St Ste A7d, Los Angeles, CA 90089. The listed phone number is (323) 409-7053.

What is Louis Nguyen's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Louis Nguyen enrolled in Medicare?

Yes. Louis Nguyen is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Louis Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Louis Nguyen reassigns Medicare benefits to Continuem (Lakewood, CA). The 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 Louis 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 Louis Nguyen was last updated on February 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.