Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Benjamin J Duffy, DO

Individual provider Internal Medicine Physician · NPI 1144210857

Dr. Benjamin J Duffy, DO practises Internal Medicine in Neenah, Wisconsin. Qualified in 2003, 23 years ago. Practices with Thedacare, Incorporated, a 654-clinician group, works from 4 locations, accepts Medicare assignment and offers telehealth. Licensed in Wisconsin.

Years since qualifying
23
Licensed in
WI
In the registry since
2005
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

200 Theda Clark Medical Plz Ste 420
Neenah, WI 54956-2771
Phone: (920) 720-7211
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 3851 Roger Brooke Dr, San Antonio, TX 78234-4501 — (210) 916-4678
  • 1818 N Meade St, Appleton, WI 54911-3454 — (920) 735-7645
  • 130 2nd St, Neenah, WI 54956-2883 — (920) 729-2738

Specialties & licences

Obesity Medicine (Internal Medicine) Physician (primary) Taxonomy 207RB0002X · Licence 48370-021 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 48370-021 (WI)
Hospitalist Physician Taxonomy 208M00000X · Licence 48370 (WI)

Record details

NPI number1144210857
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedOctober 25, 2005
Last updated in NPPESJune 6, 2024
Certification dateJune 4, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolOTHER
Graduated 2003 (23 years in practice)
Group practice Thedacare, Incorporated — 654 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients55
Services billed 216 a service is one billed item, such as a visit, a test or a procedure
Average patient age70

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Consulting Fee $2,130 2 payments
Food and Beverage $5 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Thedacare, Incorporated

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 654 clinicians in the practice; 12 are shown here.

Other providers in Neenah