Gastroenterology
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Dr. Gregory A. Derfus, MD
NPI1861465304
- Medicare services, 2023
- 66
- Part D claims, 2024
- 30
- Publications
- 1
- MIPS score, 2024
- 92
- Affiliated sites
- 1
- Practice address
- 1400 Bellinger St, Eau Claire, WI 54703-5222
- Practice phone
- Call (715) 838-5222
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mayo Clinic Health System In Eau Claire - Eau Claire (Bellinger St)
Multi-specialty group site · Eau Claire, Wisconsin
Find Dr. Derfus' professional email, personal email and mobile number
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Dr. Gregory A. Derfus is a gastroenterologist in Eau Claire, Wisconsin
Dr. Derfus practices at Mayo Clinic Health System In Eau Claire - Eau Claire (Bellinger St) in Eau Claire, Wisconsin.
Dr. Derfus' NPI, 1861465304, was assigned on February 7, 2006. Dr. Derfus graduated from Medical College of Wisconsin in 1984. Dr. Derfus holds Wisconsin license 28466.
NPI and contact details
- NPI
- 1861465304NPI Registry (opens in a new tab)
- NPI enumeration date
- February 7, 2006
- NPI status
- Active
- Practice phone
- (715) 838-5222
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 68
- Medical school graduation
- 1984
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Gregory A. Derfus practices at 2 locations in Eau Claire, Wisconsin
Dr. Derfus' primary practice is Mayo Clinic Health System in Eau Claire - Eau Claire (Bellinger St), at 1400 Bellinger St, Eau Claire, WI 54703-5222. The practice phone is (715) 838-5222. The NPI Registry lists Dr. Derfus' practice address as 1221 Whipple St, Eau Claire, WI 54703.
- Mayo Clinic Health System in Eau Claire - Eau Claire (Bellinger St)Primary1400 Bellinger St, Eau Claire, WI 54703-5222Phone(715) 838-5222
- NPI Registry address1221 Whipple St, Eau Claire, WI 54703 · Eau Claire CountyPhone(715) 838-5222
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; Doctors and Clinicians National Downloadable File (CMS); and Dmand AI Practice Data
Dr. Gregory A. Derfus is affiliated with 1 site of care and 1 medical group
Dr. Derfus' primary practice is Mayo Clinic Health System In Eau Claire - Eau Claire (Bellinger St) in Eau Claire, Wisconsin. The medical group on file is Mayo Clinic Health System in Eau Claire.
Mayo Clinic Health System In Eau Claire - Eau Claire (Bellinger St)Primary
Sources: Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dmand AI tracks the EHR system at Dr. Gregory A. Derfus' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Derfus practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Mayo Clinic Health System In Eau Claire - Eau Claire (Bellinger St) | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Gregory A. Derfus is one of 277 gastroenterologists in Wisconsin
Gastroenterology is Dr. Derfus' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Derfus is licensed in Wisconsin.
Specialties and state licenses
- Gastroenterology, WisconsinPrimary
Gastroenterologists near Dr. Derfus
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Gregory A. Derfus billed Medicare for 66 services in 2023
CMS data shows 66 Medicare services from Dr. Derfus across 3 procedure codes in 2023, all of them office visits. Medicare paid $4,403 for them. Every service was in a facility, such as a hospital, rather than an office.
Medicare services, 202366
Paid by Medicare$4,403
Procedure codes3
Dr. Derfus' Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 2202023: 6670%
Dr. Derfus compared with the Wisconsin median for gastroenterologists, 2023
- Dr. Derfus
- Wisconsin median
- Medicare services
- 66vs 32980% below
- Part D claims
- 221vs 42948% below
Medians across 278 gastroenterologists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Derfus' most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Gregory A. Derfus' patients have a median age of 71
Across all payers, Dmand AI patient panel data puts Dr. Derfus' median patient age at 71, with 40% women.
Dr. Derfus' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women40%
- Men60%
Source: Dmand AI Patient Panel Data
Dr. Gregory A. Derfus wrote 30 Medicare Part D claims in 2024
In 2024, Dr. Derfus wrote 30 Medicare Part D claims for 15 patients. 73% of them were for generic drugs. They cover 10 drugs, with $474,122 in total drug cost. In 2022, CMS named 261 claims across 13 drugs.
Part D claims, 202430
Drugs named by CMS10
Total drug cost$474,122
Part D patients15
Dr. Derfus' Part D claims by kind of drug, 2024
- Generic22 claims73%
- Brand-name and other8 claims27%
Dr. Derfus' most prescribed drugs by claims, 2023
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2022 to 2023
- 2022
- 2023
- Claims for drugs CMS names
- 2022: 2612023: 22115%
Drugs named by CMS: 10 in 2023, 13 in 2022.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. Gregory A. Derfus scored 92 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 92 out of 100 for Dr. Derfus for performance year 2024, reported as part of a group.
Dr. Derfus' MIPS scores, performance year 2024
- 92of 100Final score
- 94.9of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 74of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Gregory A. Derfus has 1 publication on record
Dmand AI links 1 paper to Dr. Derfus in 2022. Dr. Derfus' most frequent co-authors are Mohammed Barawi, MD, Daisy D. Batista, MD and David J. Cangemi, MD.
Papers1
Dr. Derfus' most frequent co-authors
- Mohammed Barawi, MD1 shared paper
- Daisy D. Batista, MD1 shared paper
- David J. Cangemi, MD1 shared paper
Recent publications by Dr. Derfus
See who Dr. Derfus researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Derfus works with, so you can find a warm path to the right gastroenterologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Gregory A. Derfus graduated from Medical College of Wisconsin
Dr. Derfus graduated from Medical College of Wisconsin in 1984.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Gregory A. Derfus's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Gregory A. Derfus
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Gregory A. Derfus' NPI number?
Dr. Gregory A. Derfus' NPI number is 1861465304. It was assigned on February 7, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Gregory A. Derfus?
Dr. Gregory A. Derfus is a gastroenterologist in Eau Claire, Wisconsin. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Gregory A. Derfus practice?
Dr. Derfus practices at 1400 Bellinger St, Eau Claire, WI 54703-5222. Dr. Derfus also practices at 1221 Whipple St, Eau Claire, WI 54703. Dr. Derfus' primary practice is Mayo Clinic Health System In Eau Claire - Eau Claire (Bellinger St) in Eau Claire, Wisconsin.
What is Dr. Gregory A. Derfus' office phone number?
The practice phone on file for Dr. Derfus is (715) 838-5222.
What is Dr. Gregory A. Derfus' medical license number?
Dr. Derfus holds Wisconsin license 28466.
What medical group is Dr. Gregory A. Derfus part of?
Dr. Derfus is linked to Mayo Clinic Health System in Eau Claire.
Does Dr. Gregory A. Derfus accept Medicare?
Yes. CMS data shows Dr. Derfus billed Medicare for 66 services in 2023.
What is Dr. Gregory A. Derfus' MIPS score?
Dr. Derfus' MIPS final score for performance year 2024 is 92 out of 100, reported as part of a group.
What services does Dr. Gregory A. Derfus bill to Medicare?
In 2023, Dr. Derfus' most billed Medicare services were office visit, established patient (99214), office visit, established patient (99215) and office visit, established patient (99213).
Where did Dr. Gregory A. Derfus go to medical school?
Dr. Derfus graduated from Medical College of Wisconsin in 1984.
Show 4 more questionsShow fewer questions
What drugs does Dr. Gregory A. Derfus prescribe most?
In 2023 Medicare Part D data, Dr. Derfus' most prescribed drugs by claims were Omeprazole, Pantoprazole Sodium and Dicyclomine HCl.
How long has Dr. Gregory A. Derfus been practicing?
Dr. Derfus graduated from medical school in 1984, 42 years ago.
Does Dr. Gregory A. Derfus do research?
Dmand AI links 1 publication to Dr. Derfus.
Who does Dr. Gregory A. Derfus publish with?
Dr. Derfus' most frequent co-authors are Mohammed Barawi, MD (1 shared paper), Daisy D. Batista, MD (1 shared paper) and David J. Cangemi, MD (1 shared paper).
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