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DR. KEN NGUYEN D.O.
NPI 1851351894
Emergency Medicine in Rialto, CA

Active since March 24, 2006PECOS EnrolledAccepts Medicare Assignment
1851 N RIVERSIDE AVE, RIALTO, CA 92376(909) 874-2371 Get Directions Write a Review

NPPES record last updated: February 19, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Nov 19, 2025, Jul 17, 2018 (2 updates tracked since 2018).

About Dr. Ken Nguyen D.o. NPPES

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

DR. KEN NGUYEN D.O. (NPI 1851351894) is an individual emergency medicine provider in Rialto, California, licensed in California (20A8914) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Bernardino, and is a graduate of Other (1995).

NPPES Registry Identity

NPI1851351894
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDR. KEN NGUYENCredential: D.O.
Location Address1851 N RIVERSIDE AVERialto, CA 92376-8069
Mailing AddressPo Box 35380Las Vegas, NV 89133-5380
Phone(909) 874-2371
Sole ProprietorNo
Medical School CMSOtherGraduated 1995
Enumeration DateMarch 24, 2006
Last NPPES UpdateFebruary 19, 20262 updates tracked since enumeration
NPPES CertifiedFebruary 19, 2026
✔ NPI 1851351894 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · 20A8914
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.
1851 N RIVERSIDE AVE, Rialto, CA 92376
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Secondary Practice Location 1

Location 11700 N Waterman AveSan Bernardino, CA 92404-5115 · Phone (909) 883-8611

Other Identifiers 1

Medicaid00AX69140CA

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

Dr. Ken Nguyen D.o. 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 ID3870539620
PECOS Enrollment IDI20050630001175
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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92376 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
$91.88 typical visit price
range $59.60 – $179.42
Typical copayment $22.97 (range $14.90 – $44.85)
Most-billed visit code 99203
Established Patient
$104.64 typical visit price
range $19.37 – $146.42
Typical copayment $26.16 (range $4.84 – $36.60)
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.

NADIA LE FLORE NP
Nurse Practitioner (Family)
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (909) 421-2700
CAMILLE CHANO MD
Family Medicine
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (909) 874-2371
ALAN LUO MD
Family Medicine
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (909) 421-2700
JEREMY JAMES NEUNER
Nurse Practitioner (Family)
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (909) 421-2700
DR. NATASHA ALEXANDER MD
Internal Medicine
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (909) 874-2371
AYAD SAID MAKAR M.D.
Emergency Medicine
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (909) 874-2371
LINDA KOSISOCHUKWU CHUDE MD
Family Medicine
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (901) 874-2371
HITESHI THAKKER M.D.
Internal Medicine
1851 N RIVERSIDE AVE
RIALTO, CA 92376
San Bernardino County (909) 583-2741

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 Ken Nguyen's NPI number?

The NPI number for Ken Nguyen is 1851351894. It was assigned to this individual provider in the NPPES registry on March 24, 2006.

Where is Ken Nguyen located?

Ken Nguyen practices at 1851 N Riverside Ave, Rialto, CA 92376. The listed phone number is (909) 874-2371.

What is Ken Nguyen's specialty?

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

Is Ken Nguyen enrolled in Medicare?

Yes. Ken 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.

When was this NPI record last updated?

The NPPES record for Ken Nguyen was last updated on February 19, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.