Rex McCallum is a Rheumatology/Immunology physician affiliated with Duke University. OpenAlex indexes 37 publications with 1,545 citations (h-index 17).
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.
Cancer & immunology
58.9%Folate Analog Metabolic Inhibitor25.6%Methotrexate89%Methotrexate Sodium12%Part D<11 patientsTNF inhibitor21.4%Humira(Cf) Pen70%Enbrel Sureclick10%Enbrel8%Humira(Cf)5%Humira Pen4%Simponi3%Part D<11 patients+ 5 more classes in this area
Metabolism & gastrointestinal
19.6%Corticosteroid17.8%Prednisone100%Part D≥89 patientsAntidiarrheal microorganisms1.8%Folic Acid100%Part D<11 patientsNervous system
8%Gabapentinoids3.7%Gabapentin76%Pregabalin24%Part D<11 patientsNonsteroidal Anti-inflammatory Drug3.2%Meloxicam67%Ibuprofen33%Part D<11 patients+ 1 more class in this area
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.
Publications
Matched to this physician's OpenAlex author record; most-cited works shown first.
- Mooren’s Ulcer with Pathologic Findings Similar to Cicatricial Pemphigoid
Journal of cornea and ocular surface.
2023 - Development of a quality improvement program in a department of ophthalmology
British Journal of Ophthalmology
2013
Similar KOLs
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John Perfect, MD
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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.”