Benjamin J. Duffy, D.O.
Obesity Medicine (Internal Medicine) Physician · Neenah, WI
Benjamin J. Duffy, D.O. is an obesity medicine (internal medicine) physician with a practice address in Neenah, Wisconsin, and NPI 1144210857, issued on Oct 25, 2005. Check the license (Wisconsin 48370-021, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Benjamin J. Duffy
- Credential
- D.O.
- Primary taxonomy
- Obesity Medicine (Internal Medicine) Physician 207RB0002X
- License numbers
- 48370-021 WI
48370 WI
Self-reported in NPPES; status is on the state search - Practice location
- 200 Theda Clark Medical Plz Ste 420, Neenah, WI 54956
- Phone
- (920) 720-7211
- Enumerated
- Oct 25, 2005
- Record last updated
- Jun 6, 2024
- Medicare enrollment
- Enrolled (PECOS I20090831000558); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
1 nearest obesity medicine (internal medicine) physician record → All 2 in Wisconsin → Look up another NPI →
Also registered at 200 Theda Clark Medical Plz Ste 420
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Betsy Winnekens, APNPNurse Practitioner1740469881
Verify Benjamin J. Duffy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 48370-021Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% fewer Medicare Part D claims than the average obesity medicine (internal medicine) physician in 2024
220 Medicare Part D claims for 65 beneficiaries, against an average of 742 among the 106 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims.
Most prescribed
- Levothyroxine Sodium27 claims
- Clonidine Hcl13 claims
- Irbesartan13 claims
- Topiramate12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $61.54
2 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 80 providers of this specialty with any payment received $6,310.67 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Thedacare, IncorporatedNeenah, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Obesity Medicine (Internal Medicine) Physician providers in Wisconsin
There are 2 obesity medicine (internal medicine) physician records in Wisconsin.
All 2 in Wisconsin → Every provider in Neenah → Obesity Medicine (Internal Medicine) Physician nationwide →
The 1 obesity medicine (internal medicine) physician record with the nearest ZIP codes
- Gabriella Baran, DOWausau, WI 544011851882344
Common questions
What is Benjamin J. Duffy, D.O.'s NPI number?
Benjamin J. Duffy, D.O.'s National Provider Identifier (NPI) is 1144210857, issued on Oct 25, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Benjamin J. Duffy, D.O. located?
The NPPES record lists a practice address at 200 Theda Clark Medical Plz Ste 420, Neenah, WI, 54956. Phone: (920) 720-7211. Providers update this record themselves, so call before visiting.
How can I verify Benjamin J. Duffy, D.O.'s license?
NPPES lists Wisconsin license number 48370-021, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Benjamin J. Duffy, D.O. prescribe under Medicare Part D?
In 2024, Benjamin J. Duffy, D.O. had 220 Medicare Part D claims for 65 beneficiaries; the average among obesity medicine (internal medicine) physician prescribers was 742. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.