Michael Duffy, MD
NPI 1922113182 · Internal Medicine Physician · Oshkosh, WI
Michael Duffy, MD is a Internal Medicine Physician provider in Oshkosh, WI (NPI 1922113182).
Provider details
- NPI number
- 1922113182
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 24370 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-20
- Last updated
- 2016-05-03
Frequently asked questions
- What is Michael Duffy's NPI number?
- Michael Duffy's National Provider Identifier (NPI) is 1922113182, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Duffy's specialty?
- Michael Duffy is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Duffy located?
- Michael Duffy's practice location on file with NPPES is 855 N Westhaven Dr, Oshkosh, WI 54904-7668.
- What is Michael Duffy's phone number?
- The practice phone number listed in the NPPES registry for Michael Duffy is (920) 303-8700.
- Is Michael Duffy's NPI active?
- Yes — Michael Duffy's NPI (1922113182) is active in the NPPES registry as of the last update on 2016-05-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.