J Duc Nguyen, M.D.
NPI 1427018456 · Internal Medicine Physician · Fontana, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
J Duc Nguyen, M.D. is a Internal Medicine Physician provider in Fontana, CA (NPI 1427018456).
Provider details
- NPI number
- 1427018456
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A62436 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
217 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 133 | $131 |
| Administration and Interpretation of Patient-Focused Health Risk Assessment96160 | 49 | $3 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 22 | $94 |
| Administration of Influenza Virus VaccineG0008 | 13 | $33 |
Typical Medicare-allowed amounts for these services range $3–$131 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 163 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 699 | 245 |
| Ibuprofen | 610 | 188 |
| Metformin Hcl | 593 | 184 |
| Lisinopril | 444 | 137 |
| Amlodipine Besylate | 358 | 110 |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 349 | 52 |
| Omeprazole |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-03-24
- Last updated
- 2014-05-05
Frequently asked questions
- What is J Duc Nguyen's NPI number?
- J Duc Nguyen's National Provider Identifier (NPI) is 1427018456, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is J Duc Nguyen's specialty?
- J Duc Nguyen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is J Duc Nguyen located?
- J Duc Nguyen's practice location on file with NPPES is 8110 Mango Ave, Fontana, CA 92335-3603.
- What is J Duc Nguyen's phone number?
- The practice phone number listed in the NPPES registry for J Duc Nguyen is (909) 822-1164.
- Does J Duc Nguyen accept Medicare?
- J Duc Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is J Duc Nguyen's NPI active?
- Yes — J Duc Nguyen's NPI (1427018456) is active in the NPPES registry as of the last update on 2014-05-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.