NPI registry status
Active
2026 NPPES data Allergy Physician NPI 1144258120 M.D.
Verify on CMS → Quan Nguyen, M.D.
Allergy Physician in Newark, Delaware.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,019 in Allergy 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
609
Medicare Part D claims · 153 beneficiaries · Allergy Physician avg: 755
MIPS score
78.6/100
▼ 4 pts below national avg 83.1 · Above neutral
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Quan Nguyen, M.D. reported a CMS MIPS final score of 78.6/100 - below the 83.1 national average - and filed 609 Medicare Part D claims in 2023.
- 78.6/100
- MIPS score · -4 vs avg
- 609
- 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.
Quan Nguyen, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
79 27th percentile higher than 27% 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 Quan Nguyen, M.D. sits
This provider among allergy physician peers
Across the 175 allergy physician providers who report both Medicare Part D prescribing and a MIPS quality score, Quan Nguyen, M.D. writes more Part D claims than 37% of them and scores higher on MIPS quality than 44% - placing this provider in the lower-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 allergy physician peer from a representative sample of 60; the gold marker is Quan Nguyen, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Quan Nguyen, M.D. 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 Quan Nguyen, M.D.?
Near national averagePrimary specialty
Allergy Physician
Medicare Part D claims
609 19% vs specialty avg
MIPS final score
78.6/100 4.5 pts vs avg
Specialty distribution in Delaware
How Allergy Physician compares to other specialties among Delaware providers
Medicare quality performance, MIPS
Quan Nguyen, M.D.'s 2023 MIPS final score plotted against the Allergy Physician national average
- MIPS Final Score
- 78.6/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Allergy Physician) - 78.6/100 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).
Quan Nguyen, M.D. appears in the CMS NPPES registry as a Allergy Physician provider holding M.D. credentials at 700 PRIDES XING STE 200, Newark, DE, 19713, with a listed phone of (302) 998-0300. NPI 1144258120 was issued on 06/29/2006.
Medicare Part D records for calendar year 2023 show 609 prescription claims written by this provider, covering 153 Medicare beneficiaries and totaling roughly $367K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 78.6/100 for the 2023 performance year (Quality 78, Cost 69.1), compared with the national average of 83.1.
Allergy Physician is a narrow specialty nationwide, with 1,019 enrolled providers across 49 states and an average of 755 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 | 1144258120 |
|---|---|
| Specialty | Allergy Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/29/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
78.631
Final Score
Avg: 83.1
78.011
Quality
69.0833
Cost
Reporting: Group practice
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
609
Total Claims
$367K
Total Drug Cost
153
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,171
- Total Day Supply
- 34,159
- Generic Drug Cost
- $17K
Patient Demographics
- Average Patient Age
- 72.1 years
- Avg HCC Risk Score
- 1.00
- Gender Split
- 72% female / 28% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Quan Nguyen, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Montelukast Sodium
Montelukast Sodium
124 claims
- Fluticasone Propio…
Fluticasone Propionate
88 claims
- Azelastine Hcl
Azelastine Hcl
85 claims
- Albuterol Sulfate … 29
Albuterol Sulfate Hfa
29 claims
- Omeprazole 23
Omeprazole
23 claims
- Symbicort 20
Symbicort
20 claims
- Dupixent Syringe 19
Dupixent Syringe
19 claims
- Hizentra 18
Hizentra
18 claims
| Drug | Claims |
|---|---|
| Montelukast Sodium | 124 |
| Fluticasone Propionate | 88 |
| Azelastine Hcl | 85 |
| Albuterol Sulfate Hfa Albuterol Sulfate | 29 |
| Omeprazole | 23 |
| Symbicort Budesonide/Formoterol Fumarate | 20 |
| Dupixent Syringe Dupilumab | 19 |
| Hizentra Immun Glob G(Igg)/Pro/Iga 0-50 | 18 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 18 |
| Spiriva Respimat Tiotropium Bromide | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Allergy Physician Overview
How Quan Nguyen, M.D. fits within the Allergy Physician landscape nationally.
1,019
Allergy Physician Providers in US
49
States with Allergy Physician
755
Avg Claims per Provider
Quan Nguyen, M.D.'s 609 claims are below the specialty average of 755.
Nearby Allergy Physician Providers in Delaware
Other clinicians with the same primary specialty enrolled in Delaware, drawn from the same CMS NPPES roster as Nguyen.
Dr. William Geimeier
M.D.
Newark, DE
Dr. Shankar Lakhani
MD
Dover, DE
Dr. Gregory Marcotte
M.D.
Wilmington, DE
Dr. Joel Temple
M.D.
Dover, DE
Dr. Michael Wydila
MD
Wilmington, DE
Compare Allergy 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 Delaware medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Allergy 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 Quan Nguyen, M.D.'s specialty? ▼
Quan Nguyen, M.D. specializes in Allergy Physician and practices in Newark, Delaware. Credentials: M.D..
How much does Quan Nguyen, M.D. prescribe under Medicare Part D? ▼
In 2023, Quan Nguyen, M.D. wrote 609 Medicare Part D claims totaling $367K in drug costs for 153 beneficiaries.
What is Quan Nguyen, M.D.'s Medicare quality score? ▼
Quan Nguyen, M.D. has a CMS MIPS Final Score of 78.6/100 (Quality: 78, Cost: 69.1). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Quan Nguyen, M.D. located? ▼
Quan Nguyen, M.D. is located at 700 PRIDES XING STE 200, Newark, DE, 19713. Phone: (302) 998-0300.
What is Quan Nguyen, M.D.'s NPI number? ▼
Quan Nguyen, M.D.'s National Provider Identifier (NPI) is 1144258120, issued on 06/29/2006.
How many Allergy Physician providers are there in the US? ▼
There are 1,019 Allergy Physician providers across 49 states in the US. The average Allergy Physician provider writes 755 Medicare Part D claims per year.
What drugs does Quan Nguyen, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Quan Nguyen, M.D.'s most frequently prescribed drugs include Montelukast Sodium, Fluticasone Propionate, Azelastine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Quan Nguyen, M.D. accept Medicare? ▼
Quan Nguyen, M.D. appears in CMS Medicare data with 609 Part D claims and 153 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Quan Nguyen, M.D.'s credentials? ▼
Quan Nguyen, M.D.'s NPI is 1144258120 with credentials M.D.. 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.