Margaret Zhou is a Gastroenterology physician affiliated with Stanford Medicine. OpenAlex indexes 74 publications with 1,163 citations (h-index 13).
Overview
Scholarship
indexed output and impact (OpenAlex)Distinct works indexed by OpenAlex, matched via ORCID.
Total citations across indexed works.
Hirsch index, productivity × impact (OpenAlex).
Clinical & industry
trials, payments and federal fundingIndustry payments
18 companies reported payments to CMS in program years 2021 onward. These are public disclosures, not judgments. The latest:
18 companies with payments on record in CMS Open Payments (2021 onward), matched to this physician's NPI. The itemized breakdown by company, amount and year is part of the full profile. Why? →
Medicare prescribing footprint (2020)
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.
Cardiovascular
76.3%Statin26.5%Atorvastatin Calcium100%Part D≥22 patientsBeta blocker14.2%Metoprolol Succinate57%Carvedilol44%Part D<11 patients+ 4 more classes in this area
Metabolism & gastrointestinal
15.7%Biguanide (metformin)8%Metformin Hcl100%Part D<11 patientsProton pump inhibitor4%Omeprazole100%Part D<11 patients+ 1 more class in this area
Hormonal (systemic)
4.3%l-Thyroxine4.3%Levothyroxine Sodium100%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.
Publications
Matched to this physician's OpenAlex author record; most-cited works shown first.
- Antireflux Surgery for Barrett's Esophagus: Where Do We Stand in Preventing Esophageal Adenocarcinoma?
Annals of the New York Academy of Sciences
2026 - Mo1197 PREVALENCE AND CHARACTERISTICS OF POST-ENDOSCOPY UPPER GASTROINTESTINAL CANCERS IN A NATIONAL CLAIMS DATABASE
Gastrointestinal Endoscopy
2026
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Bruno Medeiros, 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.”