Benjamin Duffy, D.O.
Benjamin Duffy, D.O. is an Obesity Medicine (Internal Medicine) Physician in Neenah, WI, registered under NPI 1144210857. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 200 THEDA CLARK MEDICAL PLZ STE 420, Neenah, WI 54956. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 48370-021 | WI | Internal Medicine Physician |
| 48370 | WI | Hospitalist Physician |
| 48370-021 | WI | Obesity Medicine (Internal Medicine)… primary |
This provider holds licence 48370-021 issued in WI. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 2961557772
- Enrollment ID
- I20090831000558
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Obesity Medicine covers
A physician who specializes in the treatment of obesity demonstrates competency in and a thorough understanding of the treatment of obesity and the genetic, biologic, environmental, social, and behavioral factors that contribute to obesity. The obesity medicine physician employs therapeutic interventions including diet, physical activity, behavioral change, and pharmacotherapy. The obesity medicine physician utilizes a comprehensive approach, and may include additional resources such as dietitians, exercise physiologists, mental health professionals and bariatric surgeons as indicated to achieve optimal results. Additionally, the obesity medicine physician maintains competency in providing pre- peri- and post-surgical care of bariatric surgery patients, promotes the prevention of obesity, and advocates for those who suffer from obesity. NUCC Health Care Provider Taxonomy, code 207RB0002X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207R00000X | Internal Medicine Physician | 48370-021 | WI | |
| 208M00000X | Hospitalist Physician | 48370 | WI | |
| 207RB0002X | Obesity Medicine (Internal Medicine) Physician Obesity Medicine | 48370-021 | WI | primary |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1144210857 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 25, 2005 |
| Last updated | Jun 6, 2024 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | D.O. |
| Practice address |
200 THEDA CLARK MEDICAL PLZ STE 420 Neenah, WI 54956 (920) 720-7211 |
| Mailing address |
3 NEENAH CTR Neenah, WI 54956 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 1 | 4 | 4 | 2 | 1 | 0 | 8 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 8 | 4 | 4 | 1 | 0 | 8 | 1 |
Sum = 53 · next multiple of 10 = 60 · check digit = 7 · actual last digit = 7
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.