Duc Nguyen, MD
NPI 1306945365 · Pulmonary Disease Physician · Simi Valley, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Duc Nguyen, MD is a Pulmonary Disease Physician provider in Simi Valley, CA (NPI 1306945365).
Provider details
- NPI number
- 1306945365
- Entity type
- Individual
- Primary specialty
- Pulmonary Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A53620 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
7,107 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 2,126 | $137 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 1,860 | $120 |
| Test for Allergy Using Allergenic Extract95004 | 1,040 | $4 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 625 | $97 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 321 | $176 |
| Critical Care, First 30-74 Minutes99291 | 311 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 160 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Fluticasone/Umeclidin/Vilanterbrand: Trelegy Ellipta | 500 | 169 |
| Atorvastatin Calcium | 430 | 124 |
| Amlodipine Besylate | 398 | 112 |
| Prednisone | 302 | 209 |
| Levothyroxine Sodium | 271 | 75 |
| Pantoprazole Sodium | 257 | 95 |
| Valsartan |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$4,767 across 90 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
Registry dates
- Enumerated
- 2006-09-22
- Last updated
- 2018-03-29
Frequently asked questions
- What is Duc Nguyen's NPI number?
- Duc Nguyen's National Provider Identifier (NPI) is 1306945365, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Duc Nguyen's specialty?
- Duc Nguyen is listed in the NPPES registry with a primary specialty of Pulmonary Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Duc Nguyen located?
- Duc Nguyen's practice location on file with NPPES is 2650 Jones Way, Simi Valley, CA 93065.
- What is Duc Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Duc Nguyen is (805) 520-1577.
- Does Duc Nguyen accept Medicare?
- 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 Duc Nguyen's NPI active?
- Yes — Duc Nguyen's NPI (1306945365) is active in the NPPES registry as of the last update on 2018-03-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.