NPI registry status
Active
2026 NPPES data Allergy & Immunology Physician NPI 1417049347 MD
Verify on CMS → John Simpson, MD
Allergy & Immunology Physician in Falls Church, 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 3,390 in Allergy & Immunology 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
36
Medicare Part D claims · Allergy & Immunology Physician avg: 764
Generic prescribing
67%
generic claims · 33% brand-name · higher generic rates reduce patient out-of-pocket costs
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
John Simpson, MD filed 36 Medicare Part D claims in 2023 as a Allergy & Immunology Physician in Falls Church, Virginia, prescribing 67% generic.
- 36
- Part D claims, 2023
- 67%
- generic prescribing
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.
John Simpson, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
36 0th percentile higher than 0% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. 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 Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
John Simpson, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about John Simpson, MD?
Quality data not reportedPrimary specialty
Allergy & Immunology Physician
Medicare Part D claims
36 95% vs specialty avg
Specialty distribution in Virginia
How Allergy & Immunology Physician compares to other specialties among Virginia providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Allergy & Immunology Physician. Verify directly:
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).
John Simpson, MD appears in the CMS NPPES registry as a Allergy & Immunology Physician provider holding MD credentials at 6305 CASTLE PL, Falls Church, VA, 22044, with a listed phone of (703) 534-5500. NPI 1417049347 was issued on 09/28/2006.
Medicare Part D records for calendar year 2023 show 36 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $5K in drug spend, split 33% brand-name and 67% generic by claim count.
Allergy & Immunology Physician is a narrow specialty nationwide, with 3,390 enrolled providers across 52 states and an average of 764 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 | 1417049347 |
|---|---|
| Specialty | Allergy & Immunology Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/28/2006 |
Brand vs generic prescribing mix · Above average
John Simpson, MD - brand share 33.0%
Allergy & Immunology Physician average
33% brand-name claims vs 67% generic, on 36 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.
36
Total Claims
$5K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 64
- Total Day Supply
- 1,791
- Brand vs Generic
- 33% brand / 67% generic
- Brand Drug Cost
- $3K
- Generic Drug Cost
- $1K
Patient Demographics
- Average Patient Age
- 73.1 years
- Avg HCC Risk Score
- 0.80
Allergy & Immunology Physician Overview
How John Simpson, MD fits within the Allergy & Immunology Physician landscape nationally.
3,390
Allergy & Immunology Physician Providers in US
52
States with Allergy & Immunology Physician
764
Avg Claims per Provider
John Simpson, MD's 36 claims are below the specialty average of 764.
Nearby Allergy & Immunology Physician Providers in Virginia
Other clinicians with the same primary specialty enrolled in Virginia, drawn from the same CMS NPPES roster as Simpson.
Dr. Parasmani Acharya
M.D.
Pulaski, VA
Veronica Alix
Hampton, VA
Dr. Darshana Alle
M.D.
Henrico, VA
Dr. Oral Alpan
MD
Springfield, VA
Dr. Donald Asbury
MD
Bluefield, VA
Compare Allergy & Immunology 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 Allergy & Immunology 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
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Virginia
Frequently Asked Questions
What is John Simpson, MD's specialty? ▼
John Simpson, MD specializes in Allergy & Immunology Physician and practices in Falls Church, Virginia. Credentials: MD.
How much does John Simpson, MD prescribe under Medicare Part D? ▼
In 2023, John Simpson, MD wrote 36 Medicare Part D claims totaling $5K in drug costs for N/A beneficiaries.
Where is John Simpson, MD located? ▼
John Simpson, MD is located at 6305 CASTLE PL, Falls Church, VA, 22044. Phone: (703) 534-5500.
What is John Simpson, MD's NPI number? ▼
John Simpson, MD's National Provider Identifier (NPI) is 1417049347, issued on 09/28/2006.
Does John Simpson, MD prescribe more brand-name or generic drugs? ▼
John Simpson, MD's prescribing is 33% brand-name and 67% generic drugs by claim count, with $3K in brand drug costs.
How many Allergy & Immunology Physician providers are there in the US? ▼
There are 3,390 Allergy & Immunology Physician providers across 52 states in the US. The average Allergy & Immunology Physician provider writes 764 Medicare Part D claims per year.
Does John Simpson, MD accept Medicare? ▼
John Simpson, MD appears in CMS Medicare data with 36 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Simpson, MD's credentials? ▼
John Simpson, MD's NPI is 1417049347 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.
- 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.