NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1144210857 D.O.
Verify on CMS → Benjamin Duffy, D.O.
Internal Medicine Physician in Neenah, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 in Internal Medicine 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
479
Medicare Part D claims · 111 beneficiaries · Internal Medicine Physician avg: 3K
Industry payments
$61.54
2 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Benjamin Duffy, D.O. filed 479 Medicare Part D claims in 2023 as an Internal Medicine Physician in Neenah, Wisconsin.
- 479
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥62nd
- pct by Part D claim volume (lower-bound band)
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.
CMS NPPES provider registry desk
NPI 1144210857 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-LIGHT · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1144210857
- ENUM-LEGACY 2005
- TAX-MEGA 173K Internal Medicine
- RX-LIGHT 479
- BOOK-LIGHT 2,834 in Wisconsin
- PHOTO-ENUM Thomas Nardi · 2005
Benjamin Duffy, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
479 ≥ 62nd percentile 62% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Benjamin Duffy, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Benjamin Duffy, D.O.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
479 82% vs specialty avg
Specialty distribution in Wisconsin
How Internal Medicine Physician compares to other specialties among Wisconsin 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 Internal Medicine 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).
Practice Address
Provider Details
| NPI | 1144210857 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 10/25/2005 |
Hospital and facility affiliations
Facilities where Benjamin Duffy, D.O. 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.
Thedacare Incorporated
Neenah, WI
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 Benjamin Duffy, D.O.. Source: openpaymentsdata.cms.gov.
Total received
$62
Largest payer
Novo Nordisk 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.
479
Total Claims
$38K
Total Drug Cost
111
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 601
- Total Day Supply
- 15,055
- Generic Drug Cost
- $6K
- Antibiotic Claims
- 42
Patient Demographics
- Average Patient Age
- 72.1 years
- Avg HCC Risk Score
- 2.68
- Gender Split
- 50% female / 50% male
- Age Distribution
- <65: 22, 65-74: 43, 75-84: 32, 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 Benjamin Duffy, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Eliquis
Eliquis
29 claims
- Furosemide
Furosemide
23 claims
- Amlodipine Besylate
Amlodipine Besylate
21 claims
- Levetiracetam
Levetiracetam
19 claims
- Levothyroxine Sodium
Levothyroxine Sodium
19 claims
- Metoprolol Tartrate
Metoprolol Tartrate
19 claims
- Lisinopril
Lisinopril
18 claims
- Atorvastatin Calcium
Atorvastatin Calcium
17 claims
| Drug | Claims |
|---|---|
| Eliquis Apixaban | 29 |
| Furosemide | 23 |
| Amlodipine Besylate | 21 |
| Levetiracetam | 19 |
| Levothyroxine Sodium | 19 |
| Metoprolol Tartrate | 19 |
| Lisinopril | 18 |
| Atorvastatin Calcium | 17 |
| Potassium Chloride | 17 |
| Clopidogrel Clopidogrel Bisulfate | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Benjamin Duffy, D.O. fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Benjamin Duffy, D.O.'s 479 claims are below the specialty average of 2,716.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Duffy, both outside Wisconsin so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2005)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Duffy.
One of 2,834 Internal Medicine Physician providers enrolled in Wisconsin, 5 are shown here.
Dr. Sheetal Aatrai
MD
Marshfield, WI
Dr. Ihab Abdalrahman
MD
Marshfield, WI
Dr. Khalid Abdelgadir
MD
Manitowoc, WI
Dr. Kareem Abdelhadi
MD
Rice Lake, WI
Dr. Mesfin Abdissa
MD
Milwaukee, WI
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Benjamin Duffy, D.O.'s specialty? ▼
Benjamin Duffy, D.O. specializes in Internal Medicine Physician and practices in Neenah, Wisconsin. Credentials: D.O..
How much does Benjamin Duffy, D.O. prescribe under Medicare Part D? ▼
In 2023, Benjamin Duffy, D.O. wrote 479 Medicare Part D claims totaling $38K in drug costs for 111 beneficiaries.
Where is Benjamin Duffy, D.O. located? ▼
Benjamin Duffy, D.O. is located at 200 THEDA CLARK MEDICAL PLZ STE 420, Neenah, WI, 54956. Phone: (920) 720-7211.
What is Benjamin Duffy, D.O.'s NPI number? ▼
Benjamin Duffy, D.O.'s National Provider Identifier (NPI) is 1144210857, issued on 10/25/2005.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Benjamin Duffy, D.O. prescribe most often? ▼
Based on 2023 Medicare Part D data, Benjamin Duffy, D.O.'s most frequently prescribed drugs include Eliquis, Furosemide, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Benjamin Duffy, D.O. accept Medicare? ▼
Benjamin Duffy, D.O. appears in CMS Medicare data with 479 Part D claims and 111 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Benjamin Duffy, D.O.'s credentials? ▼
Benjamin Duffy, D.O.'s NPI is 1144210857 with credentials D.O.. 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
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.