Ken Nguyen, D.O.
NPI 1851351894 · Emergency Medicine Physician · Rialto, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ken Nguyen, D.O. is a Emergency Medicine Physician provider in Rialto, CA (NPI 1851351894).
Provider details
- NPI number
- 1851351894
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 20A8914 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
2 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 22 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 168 | 149 |
| Ibuprofen | 127 | 123 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 83 | 81 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 71 | 66 |
| Cephalexin | 62 | 58 |
| Ciprofloxacin Hcl | 59 | 54 |
| Prednisone | 58 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$73 across 4 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 1700 N Waterman AveSan Bernardino, CA 92404-5115Phone: (909) 883-8611
Registry dates
- Enumerated
- 2006-03-24
- Last updated
- 2026-02-19
- Certified
- 2026-02-19
Frequently asked questions
- What is Ken Nguyen's NPI number?
- Ken Nguyen's National Provider Identifier (NPI) is 1851351894, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ken Nguyen's specialty?
- Ken Nguyen is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Ken Nguyen located?
- Ken Nguyen's practice location on file with NPPES is 1851 N Riverside Ave, Rialto, CA 92376-8069.
- What is Ken Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Ken Nguyen is (909) 874-2371.
- Does Ken Nguyen accept Medicare?
- Ken Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ken Nguyen's NPI active?
- Yes — Ken Nguyen's NPI (1851351894) is active in the NPPES registry as of the last update on 2026-02-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.