Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Benjamin J Duffy, DO

Individual provider Internal Medicine Physician · NPI 1144210857

Dr. Benjamin J Duffy, DO is an 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.

See every abbreviation used in this directory →

Practice location Address checks out

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

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
Mailing address3 Neenah Ctr, Neenah, WI 54956-3070

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

Other providers in Neenah