Gregory Derfus is a Gastroenterology physician affiliated with Mayo Clinic Health System. OpenAlex indexes 9 publications with 803 citations (h-index 7).
Overview
Scholarship
indexed output and impact (OpenAlex)Distinct works indexed by OpenAlex.
Total citations across indexed works.
Hirsch index, productivity × impact (OpenAlex).
Medicare prescribing footprint (2023)
The drugs this prescriber writes for Medicare patients, grouped by drug class and therapeutic area. Every percentage is a share of their total prescribing, so you can see what they prescribe most. These are proportions, not patient counts or dollar amounts. No condition is inferred: the claims record what was prescribed, never why.
Metabolism & gastrointestinal
87.8%Proton pump inhibitor42.5%Omeprazole66%Pantoprazole Sodium34%Part D<11 patientsAnticholinergic10%Dicyclomine Hcl100%Part D<11 patients+ 5 more classes in this area
Cancer & immunology
12.2%TNF inhibitor6.8%Humira(Cf) Pen100%Part D<11 patientsInterleukin-12 Antagonist5.4%Stelara100%Part D<11 patients
Drug classes come from the WHO ATC and U.S. National Library of Medicine (RxClass) classifications; prescribing counts come from the CMS Medicare Part D Prescribers file. Each drug is counted once, under its primary class. Medicare fee-for-service only, so no Medicare Advantage, commercial, or pediatric prescribing is included. CMS publishes this data about 17 months after the fact.
Similar KOLs
Other experts from the same institution or the same specialty.
John Schirger, MD
Mayo Clinic Health System
Richard Helmers, MD
Mayo Clinic Health System
Andrew Calvin, MD
Mayo Clinic Health System
Vaibhav Vaidya, MBBS
Mayo Clinic Health System
A basic profile from our physician directory: identity and practice contact from the federal NPPES registry, research from OpenAlex, trials from ClinicalTrials.gov, payments from CMS Open Payments — shown itemized where we have matched records, as a count where we only have a total. This person hasn't been through our full identity-adjudication pipeline yet, so funding, congress activity and public presence aren't shown. Absence of a section means “not yet looked,” never “none found.”