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 9,323 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
10K
Medicare Part D claims · 762 beneficiaries · Pulmonary Disease Physician avg: 1K
Generic prescribing
82%
generic claims · 17% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
57.2/100
▼ 26 pts below national avg 83.1 · Mid-tier
Industry payments
$4.8K
90 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Duc Nguyen, MD reported a CMS MIPS final score of 57.2/100 - below the 83.1 national average - and filed 10,152 Medicare Part D claims in 2023.
- 57.2/100
- MIPS score · -26 vs avg
- 10K
- Part D claims, 2023
- 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.
Duc Nguyen, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
57 5th percentile higher than 5% of 477,587 scored providers
Each bar is a band; taller bars hold more scored 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Duc Nguyen, MD sits
This provider among pulmonary disease physician peers
Across the 2,676 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 8% - placing this provider in the high-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
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
10,152 7× vs specialty avg
MIPS final score
57.2/100 25.9 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 83.1 national avg · 2023 performance year
MIPS final score (Pulmonary Disease Physician) - 57.2/100 vs national avg 83.1
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).
Duc Nguyen, MD appears in the CMS NPPES registry as a Pulmonary Disease Physician provider holding MD credentials at 2650 JONES WAY, Simi Valley, CA, 93065, with a listed phone of (805) 520-1577. NPI 1306945365 was issued on 09/22/2006.
Medicare Part D records for calendar year 2023 show 10,152 prescription claims written by this provider, covering 762 Medicare beneficiaries and totaling roughly $2.1 million in drug spend, split 17% brand-name and 82% generic by claim count, with an opioid prescribing rate of 1.9%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 57.2/100 for the 2023 performance year (Quality 81.3, Cost 39.8), compared with the national average of 83.1.
Pulmonary Disease Physician is a mid-sized specialty nationwide, with 9,323 enrolled providers across 53 states and an average of 1,457 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
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
Avg: 83.1
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 17.0%
Pulmonary Disease Physician average
17% brand-name claims vs 82% generic, on 10,152 2023 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 2023.
10,152
Total Claims
$2.1M
Total Drug Cost
762
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 19,649
- Total Day Supply
- 561,397
- Brand vs Generic
- 17% brand / 82% generic
- Brand Drug Cost
- $1.8M
- Generic Drug Cost
- $326K
- Opioid Claims
- 191 (1.9% rate)
- Antibiotic Claims
- 496
Patient Demographics
- Average Patient Age
- 76.4 years
- Avg HCC Risk Score
- 1.45
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 40, 65-74: 279, 75-84: 310, 85+: 133
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Duc Nguyen, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
434 claims
- Amlodipine Besylate
Amlodipine Besylate
396 claims
- Trelegy Ellipta
Trelegy Ellipta
332 claims
- Levothyroxine Sodium
Levothyroxine Sodium
266 claims
- Prednisone
Prednisone
264 claims
- Valsartan
Valsartan
250 claims
- Fluticasone Propio…
Fluticasone Propionate
215 claims
- Metformin Hcl
Metformin Hcl
214 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 434 |
| Amlodipine Besylate | 396 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 332 |
| Levothyroxine Sodium | 266 |
| Prednisone | 264 |
| Valsartan | 250 |
| Fluticasone Propionate | 215 |
| Metformin Hcl | 214 |
| Pantoprazole Sodium | 205 |
| Lisinopril | 176 |
* 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.
9,323
Pulmonary Disease Physician Providers in US
53
States with Pulmonary Disease Physician
1,457
Avg Claims per Provider
Duc Nguyen, MD's 10,152 claims are above the specialty average of 1,457.
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.
Dr. Manoochehr Abadian Sharifabad
M.D.
Fountain Valley, CA
Dr. Mohamad Abdelfattah
MD
Fullerton, CA
Dr. 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 →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Pulmonary Disease Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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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 2023, Duc Nguyen, MD wrote 10,152 Medicare Part D claims totaling $2.1M in drug costs for 762 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 national average MIPS Final Score is 83.1. 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 17% brand-name and 82% generic drugs by claim count, with $1.8M in brand drug costs.
Does Duc Nguyen, MD prescribe opioids? ▼
Yes, Duc Nguyen, MD had 191 opioid claims in 2023 with an opioid prescribing rate of 1.9%.
How many Pulmonary Disease Physician providers are there in the US? ▼
There are 9,323 Pulmonary Disease Physician providers across 53 states in the US. The average Pulmonary Disease Physician provider writes 1,457 Medicare Part D claims per year.
What drugs does Duc Nguyen, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Duc Nguyen, MD's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Trelegy Ellipta. 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 10,152 Part D claims and 762 Medicare beneficiaries in 2023. 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.
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 May 2026.