NPI registry status
Active
2026 NPPES data Pulmonary Disease Physician NPI 1306945365 MD
Verify on CMS → Duc Nguyen, MD
Pulmonary Disease Physician in Simi Valley, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 9,647 in Pulmonary Disease Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
11K
Medicare Part D claims · 821 beneficiaries · Pulmonary Disease Physician avg: 1K
Generic prescribing
82%
generic claims · 18% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
57.2/100
▼ 26 pts below national avg 83.5 · Mid-tier
Industry payments
$4.8K
90 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2024
What the federal data shows
Duc Nguyen, MD reported a CMS MIPS final score of 57.2/100 - below the 83.5 national average - and filed 10,580 Medicare Part D claims in 2024.
- 57.2/100
- MIPS score · -26 vs avg
- 11K
- Part D claims, 2024
- 82%
- generic prescribing
- Likely
- board-certified (heuristic)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Duc Nguyen, MD
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1306945365), first enumerated 09/22/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 10,580 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 57.2/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Industry payment transparency
$4.8K in reported industry payments (90 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Duc Nguyen, MD's individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1306945365 · Pulmonary Disease Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-LOW · RX-HEAVY · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1306945365
- ENUM-LEGACY 2006
- TAX-MID 10K Pulmonary Disease
- MIPS-LOW 57.2/100
- RX-HEAVY 11K claims
- BOOK-LIGHT 905 in California
- PHOTO-FINISH Vincenzo Novara, MD · ±0.1
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Gerald Pruitt, D…
Gerald Pruitt, DO
56.4 MIPS pts
- Mhd Chaker, MD ·…
Mhd Chaker, MD
56.9 MIPS pts
- Nguyen · this pr…
Nguyen · this provider
57.2 MIPS pts
- Vincenzo Novara,…
Vincenzo Novara, MD
57.3 MIPS pts
- Harseerat Rataul…
Harseerat Rataul, MD
57.9 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Duc Nguyen, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
57 ≥ 5th percentile 5% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Duc Nguyen, MD sits
This provider among pulmonary disease physician peers
Across the 2,467 pulmonary disease physician providers who report both Medicare Part D prescribing and a MIPS quality score, Duc Nguyen, MD writes more Part D claims than 99% of them and scores higher on MIPS quality than 9% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one pulmonary disease physician peer from a representative sample of 60; the gold marker is Duc Nguyen, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Duc Nguyen, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Duc Nguyen, MD?
Below national averagePrimary specialty
Pulmonary Disease Physician
Medicare Part D claims
10,580 7× vs specialty avg
MIPS final score
57.2/100 26.3 pts vs avg
Specialty distribution in California
How Pulmonary Disease Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Duc Nguyen, MD's 2023 MIPS final score plotted against the Pulmonary Disease Physician national average
- MIPS Final Score
- 57.2/100
- vs 83.5 national avg · 2023 performance year
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1306945365 |
|---|---|
| Specialty | Pulmonary Disease Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/22/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
57.2075
Final Score
Measured-score avg: 83.5
81.2525
Quality
39.8283
Cost
0
Promoting Interoperability
Reporting: Individual
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Duc Nguyen, MD. Source: openpaymentsdata.cms.gov.
Total received
$4.8K
Largest payer
Actelion Pharmaceuticals US, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Duc Nguyen, MD. To verify Duc Nguyen, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Brand vs generic prescribing mix · Typical
Duc Nguyen, MD - brand share 18.0%
Pulmonary Disease Physician average
18% brand-name claims vs 82% generic, on 10,580 2024 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
10,580
Total Claims
$2.3M
Total Drug Cost
821
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 20,249.633
- Total Day Supply
- 577,795
- Brand vs Generic
- 18% brand / 82% generic
- Brand Drug Cost
- $2.1M
- Generic Drug Cost
- $198K
- Opioid Claims
- 166 (1.6% rate)
- Antibiotic Claims
- 523
Patient Demographics
- Average Patient Age
- 76.9 years
- Avg HCC Risk Score
- 1.60
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 30, 65-74: 298, 75-84: 347, 85+: 146
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Duc Nguyen, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Trelegy Ellipta
Trelegy Ellipta
500 claims
- Atorvastatin Calcium
Atorvastatin Calcium
430 claims
- Amlodipine Besylate
Amlodipine Besylate
398 claims
- Prednisone
Prednisone
302 claims
- Levothyroxine Sodium
Levothyroxine Sodium
271 claims
- Pantoprazole Sodium
Pantoprazole Sodium
257 claims
- Valsartan
Valsartan
230 claims
- Metformin Hcl
Metformin Hcl
225 claims
| Drug | Claims |
|---|---|
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 500 |
| Atorvastatin Calcium | 430 |
| Amlodipine Besylate | 398 |
| Prednisone | 302 |
| Levothyroxine Sodium | 271 |
| Pantoprazole Sodium | 257 |
| Valsartan | 230 |
| Metformin Hcl | 225 |
| Fluticasone Propionate | 211 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 202 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Pulmonary Disease Physician Overview
How Duc Nguyen, MD fits within the Pulmonary Disease Physician landscape nationally.
9,647
Pulmonary Disease Physician Providers in US
53
States with Pulmonary Disease Physician
1,498
Avg Claims per Provider
Duc Nguyen, MD's 10,580 claims are above the specialty average of 1,498.
Nationwide Pulmonary Disease Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Nguyen, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (57.2 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Pulmonary Disease Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Nguyen.
One of 905 Pulmonary Disease Physician providers enrolled in California, 5 are shown here.
Dr. Manoochehr Abadian Sharifabad
M.D.
Fountain Valley, CA
Dr. Mohamad Abdelfattah
MD
Fullerton, CA
Zainab Abdulsada
MBCHB
Sacramento, CA
Dr. Ayham Aboeed
M.D.
Bakersfield, CA
Dr. Babak Abrishami
D.O.
Los Angeles, CA
Compare Pulmonary Disease Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Duc Nguyen, MD's specialty? ▼
Duc Nguyen, MD specializes in Pulmonary Disease Physician and practices in Simi Valley, California. Credentials: MD.
How much does Duc Nguyen, MD prescribe under Medicare Part D? ▼
In 2024, Duc Nguyen, MD wrote 10,580 Medicare Part D claims totaling $2.3M in drug costs for 821 beneficiaries.
What is Duc Nguyen, MD's Medicare quality score? ▼
Duc Nguyen, MD has a CMS MIPS Final Score of 57.2/100 (Quality: 81.3, Cost: 39.8). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Duc Nguyen, MD located? ▼
Duc Nguyen, MD is located at 2650 JONES WAY, Simi Valley, CA, 93065. Phone: (805) 520-1577.
What is Duc Nguyen, MD's NPI number? ▼
Duc Nguyen, MD's National Provider Identifier (NPI) is 1306945365, issued on 09/22/2006.
Does Duc Nguyen, MD prescribe more brand-name or generic drugs? ▼
Duc Nguyen, MD's prescribing is 18% brand-name and 82% generic drugs by claim count, with $2.1M in brand drug costs.
Does Duc Nguyen, MD prescribe opioids? ▼
Yes, Duc Nguyen, MD had 166 opioid claims in 2024 with an opioid prescribing rate of 1.6%.
How many Pulmonary Disease Physician providers are there in the US? ▼
There are 9,647 Pulmonary Disease Physician providers across 53 states in the US. The average Pulmonary Disease Physician provider writes 1,498 Medicare Part D claims per year.
What drugs does Duc Nguyen, MD prescribe most often? ▼
Based on 2024 Medicare Part D data, Duc Nguyen, MD's most frequently prescribed drugs include Trelegy Ellipta, Atorvastatin Calcium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Duc Nguyen, MD accept Medicare? ▼
Duc Nguyen, MD appears in CMS Medicare data with 10,580 Part D claims and 821 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Duc Nguyen, MD's credentials? ▼
Duc Nguyen, MD's NPI is 1306945365 with credentials MD. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.