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Gregory Derfus, MD
NPI 1861465304 · Gastroenterology Physician · Eau Claire, WI
Gregory Derfus, MD is a Gastroenterology Physician provider in Eau Claire, WI (NPI 1861465304).
Provider details
- NPI number
- 1861465304
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 28466 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(91/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
1400 Bellinger St
Eau Claire, WI 54703-5222
Phone: (715) 838-5222
Street-level locationGet directions
Mailing address
Po Box 1510
Eau Claire, WI 54702-1510
Registry dates
- Enumerated
- 2006-02-07
- Last updated
- 2024-02-09
- Certified
- 2024-02-09
Frequently asked questions
- What is Gregory Derfus's NPI number?
- Gregory Derfus's National Provider Identifier (NPI) is 1861465304, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Derfus's specialty?
- Gregory Derfus is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Derfus located?
- Gregory Derfus's practice location on file with NPPES is 1400 Bellinger St, Eau Claire, WI 54703-5222.
- What is Gregory Derfus's phone number?
- The practice phone number listed in the NPPES registry for Gregory Derfus is (715) 838-5222.
- Is Gregory Derfus's NPI active?
- Yes — Gregory Derfus's NPI (1861465304) is active in the NPPES registry as of the last update on 2024-02-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.