NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1811121213 MD
Verify on CMS → Dennis Nguyen, MD
Hospitalist Physician in Springfield, Virginia.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,938 in Hospitalist 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
723
Medicare Part D claims · 318 beneficiaries · Hospitalist Physician avg: 888
MIPS score
90.7/100
▲ 8 pts above national avg 83.1 · Exceptional
Industry payments
$1.4K
71 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Dennis Nguyen, MD reported a CMS MIPS final score of 90.7/100 - above the 83.1 national average - and filed 723 Medicare Part D claims in 2023.
- 90.7/100
- MIPS score · +8 vs avg
- 723
- Part D claims, 2023
- 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.
Dennis 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
91 Top 40% higher than 60% 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 Dennis Nguyen, MD sits
This provider among hospitalist physician peers
Across the 4,437 hospitalist physician providers who report both Medicare Part D prescribing and a MIPS quality score, Dennis Nguyen, MD writes more Part D claims than 86% of them and scores higher on MIPS quality than 56% - placing this provider in the high-volume, high-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 hospitalist physician peer from a representative sample of 60; the gold marker is Dennis Nguyen, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Dennis Nguyen, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - 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 Dennis Nguyen, MD?
High performer (top quartile)Primary specialty
Hospitalist Physician
Medicare Part D claims
723 19% vs specialty avg
MIPS final score
90.7/100 7.6 pts vs avg
Specialty distribution in Virginia
How Hospitalist Physician compares to other specialties among Virginia providers
Medicare quality performance, MIPS
Dennis Nguyen, MD's 2023 MIPS final score plotted against the Hospitalist Physician national average
- MIPS Final Score
- 90.7/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Hospitalist Physician) - 90.7/100 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).
Dennis Nguyen, MD appears in the CMS NPPES registry as a Hospitalist Physician provider holding MD credentials at 5510 ALMA LN, Springfield, VA, 22151, with a listed phone of (703) 642-5990. NPI 1811121213 was issued on 05/13/2009.
Medicare Part D records for calendar year 2023 show 723 prescription claims written by this provider, covering 318 Medicare beneficiaries and totaling roughly $326K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 90.7/100 for the 2023 performance year (Quality 81.4), compared with the national average of 83.1.
Hospitalist Physician is a mid-sized specialty nationwide, with 16,938 enrolled providers across 54 states and an average of 888 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 | 1811121213 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 05/13/2009 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
90.7153
Final Score
Avg: 83.1
81.4307
Quality
Reporting: Individual
Hospital and facility affiliations
Facilities where Dennis Nguyen, MD bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Virginia Medical Alliance, P.C.
Springfield, VA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Dennis Nguyen, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.4K
Largest payer
ABBVIE 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
723
Total Claims
$326K
Total Drug Cost
318
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,287
- Total Day Supply
- 31,836
- Generic Drug Cost
- $30K
- Antibiotic Claims
- 36
Patient Demographics
- Average Patient Age
- 71.4 years
- Avg HCC Risk Score
- 0.98
- Gender Split
- 59% female / 41% male
- Age Distribution
- <65: 29, 65-74: 181, 75-84: 94, 85+: 14
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Dennis Nguyen, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Pantoprazole Sodium
Pantoprazole Sodium
118 claims
- Clenpiq
Clenpiq
117 claims
- Famotidine
Famotidine
59 claims
- Omeprazole
Omeprazole
50 claims
- Sutab
Sutab
50 claims
- Dicyclomine Hcl 36
Dicyclomine Hcl
36 claims
- Linzess 27
Linzess
27 claims
- Esomeprazole Magne… 25
Esomeprazole Magnesium
25 claims
| Drug | Claims |
|---|---|
| Pantoprazole Sodium | 118 |
| Clenpiq Sod Picosulf/Mag Ox/Citric Ac | 117 |
| Famotidine | 59 |
| Omeprazole | 50 |
| Sutab Sod Sulf/Pot Chloride/Mag Sulf | 50 |
| Dicyclomine Hcl | 36 |
| Linzess Linaclotide | 27 |
| Esomeprazole Magnesium | 25 |
| Dexlansoprazole Dr Dexlansoprazole | 19 |
| Zenpep Lipase/Protease/Amylase | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Hospitalist Physician Overview
How Dennis Nguyen, MD fits within the Hospitalist Physician landscape nationally.
16,938
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider
Dennis Nguyen, MD's 723 claims are below the specialty average of 888.
Nearby Hospitalist Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Nguyen.
Dr. Ramy Abdelfattah
M.D.
Fredericksburg, VA
Dr. Abdallah Abdelrazeq
M.D
Charlottesville, VA
Dr. Mohammed Abdulghani
MD
Tappahannock, VA
Dr. Mohammad Abolhassani
M.D.
Norfolk, VA
Dr. Christopher Achilli
MD
Richmond, VA
Compare Hospitalist 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 Virginia medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hospitalist 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.
Healthcare Guides
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Medical Specialties Explained
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Frequently Asked Questions
What is Dennis Nguyen, MD's specialty? ▼
Dennis Nguyen, MD specializes in Hospitalist Physician and practices in Springfield, Virginia. Credentials: MD.
How much does Dennis Nguyen, MD prescribe under Medicare Part D? ▼
In 2023, Dennis Nguyen, MD wrote 723 Medicare Part D claims totaling $326K in drug costs for 318 beneficiaries.
What is Dennis Nguyen, MD's Medicare quality score? ▼
Dennis Nguyen, MD has a CMS MIPS Final Score of 90.7/100 (Quality: 81.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Dennis Nguyen, MD located? ▼
Dennis Nguyen, MD is located at 5510 ALMA LN, Springfield, VA, 22151. Phone: (703) 642-5990.
What is Dennis Nguyen, MD's NPI number? ▼
Dennis Nguyen, MD's National Provider Identifier (NPI) is 1811121213, issued on 05/13/2009.
How many Hospitalist Physician providers are there in the US? ▼
There are 16,938 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
What drugs does Dennis Nguyen, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Dennis Nguyen, MD's most frequently prescribed drugs include Pantoprazole Sodium, Clenpiq, Famotidine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Dennis Nguyen, MD accept Medicare? ▼
Dennis Nguyen, MD appears in CMS Medicare data with 723 Part D claims and 318 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Dennis Nguyen, MD's credentials? ▼
Dennis Nguyen, MD's NPI is 1811121213 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
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.