DR. KEN NGUYEN D.O.
NPI 1851351894
Emergency Medicine in Rialto, CA
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
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
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
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.
Medicare Billing Reassignments
3Medicare enrollment records show Ken Nguyen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fontana, CA 92335
- Reassigned Medicare billing, California enrollment
- 149 clinicians in this Medicare group
Redlands, CA 92373
- Reassigned Medicare billing, California enrollment
- 635 clinicians in this Medicare group
Tustin, CA 92780
- Reassigned Medicare billing, California enrollment
- 2,052 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.
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.
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.
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.
Which organizations bill Medicare for Ken Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ken Nguyen reassigns Medicare benefits to 3 organizations: Pinnacle Medical Group, Inc (Fontana, CA), Beaver Medical Group P C (Redlands, CA) and Healthcare Partners Affiliates Medical Group (Tustin, 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 Ken 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 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 8 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.
# Dr. Ken Nguyen, D.O. · NPI 1851351894
Emergency Medicine physician in Rialto, California. Individual provider, active in the CMS NPPES registry since March 24, 2006.
## Identity
- **NPI:** 1851351894 (Entity type: Individual)
- **Enumerated:** March 24, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** 20A8914 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1851 N RIVERSIDE AVE, Rialto, CA 92376-8069
- **Phone:** (909) 874-2371
## 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): Pinnacle Medical Group, Inc (NPI 1376876912, Fontana, CA); Beaver Medical Group P C (NPI 1649503319, Redlands, CA); Healthcare Partners Affiliates Medical Group (NPI 1891981502, Tustin, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1995
## Record status
- **NPPES last updated:** February 19, 2026
- **Other identifiers:** Medicaid 00AX69140 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1851351894) · Data from the CMS NPPES public registry.