1. Home
  2. Directory
  3. Wisconsin
  4. Eau Claire
  5. Internal Medicine
  6. NPI Profile

GREGORY A DERFUS MD
NPI 1861465304
Internal Medicine - Gastroenterology in Eau Claire, WI

Active since February 07, 2006
1400 BELLINGER ST, EAU CLAIRE, WI 54703(715) 838-5222 Get Directions Write a Review

NPPES record last updated: February 9, 2024. Verified against the NPPES registry weekly; last sync: August 02, 2026.

Record update history: Feb 9, 2024, Sep 14, 2020, May 20, 2019 (3 updates tracked since 2019).

About Gregory A Derfus Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GREGORY A DERFUS MD (NPI 1861465304) is an individual gastroenterology provider in Eau Claire, Wisconsin, licensed in Wisconsin (28466) and active in the NPI registry since February 2006.

NPPES Registry Identity

NPI1861465304
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameGREGORY A DERFUSCredential: MD
Location Address1400 BELLINGER STEau Claire, WI 54703-5222
Mailing AddressPo Box 1510Eau Claire, WI 54702-1510 · (715) 838-5222
Phone(715) 838-5222
Sole ProprietorNo
Enumeration DateFebruary 7, 2006
Last NPPES UpdateFebruary 9, 20243 updates tracked since enumeration
NPPES CertifiedFebruary 9, 2024
✔ NPI 1861465304 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in WI · 28466
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
1400 BELLINGER ST, Eau Claire, WI 54703
Open in Google Maps ↗

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ELLEN A CHRISTENSEN OT
Occupational Therapist
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-5222
JESSICA ERIN ROETS OT
Occupational Therapist
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-5222
SUZANNE M STEWART LPC
Counselor (Professional)
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-5222
KATHRYN LEIGH OLSON MHA, RD, LDN,CDE
Dietitian, Registered
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-5222
CAMILLA MICHELLE NELSON MD
Pediatrics
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-5222
SARAH HOTOVY MD
Family Medicine
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-3311
JADE ELLIE JEHN
Occupational Therapist
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-5222
ANDREA AGUAYO PHARMD
Pharmacist
1400 BELLINGER ST
EAU CLAIRE, WI 54703
Eau Claire County (715) 838-5222

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Gregory Derfus's NPI number?

The NPI number for Gregory Derfus is 1861465304. It was assigned to this individual provider in the NPPES registry on February 7, 2006.

Where is Gregory Derfus located?

Gregory Derfus practices at 1400 Bellinger St, Eau Claire, WI 54703. The listed phone number is (715) 838-5222.

What is Gregory Derfus's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

When was this NPI record last updated?

The NPPES record for Gregory Derfus was last updated on February 9, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.