William Hasler is a Gastroenterology physician. OpenAlex indexes 408 publications with 19,389 citations (h-index 69); ClinicalTrials.gov lists 1 registered study matched to this name. By OpenAlex citation count, this profile ranks in the top 5% of Gastroenterology profiles in the findmyKOL directory.
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 fundingContact
The practice address and phone this provider lists in the federal NPPES (CMS) registry.
Practice address
1500 E Medical Center Dr
Ann Arbor, MI 481095000
Telephone
734-936-4000Provider last certified this registry record 18 Oct 2021.
Clinical trials
- Pyloric Sphincter Abnormalities in Patients With Gastroparesis Symptoms
Sponsor: Johns Hopkins Bloomberg School of Public Health
- A Pilot Study on the Efficacy and Safety of Olanzapine in Gastroparesis
Sponsor: University of Michigan
- Gastroparesis Registry
Sponsor: Johns Hopkins Bloomberg School of Public Health
Registered studies on ClinicalTrials.gov where the overall official or a site investigator name-matches this physician, confirmed against known institution/geography. Latest few shown; the full list is part of the full profile.
Industry payments
5 companies reported payments to CMS in program years 2021 onward. These are public disclosures, not judgments. The latest:
- Enterra Medical, Inc.Program year20256 payments
- Cumberland Pharmaceuticals, Inc.Program year20251 payment
- Atmo Biosciences IncProgram year20251 payment
Payment records matched to this physician's NPI in CMS Open Payments, program years 2021 onward.
Medicare prescribing footprint (2024)
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
59.6%H2 blocker21%Famotidine100%Part D<11 patientsProton pump inhibitor9.6%Pantoprazole Sodium100%Part D<11 patients+ 6 more classes in this area
Sensory organs
21%Aminoglycoside Antibacterial21%Gentamicin Sulfate80%Neomycin Sulfate20%Part D<11 patientsNervous system
11.5%Other antidepressants11.5%Mirtazapine100%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.
NIH funding
3 NIH research awards on record, funded 1999–2015 per NIH RePORTER. The latest:
- Gastroparesis Clinical Research Consortium-University of Michigan Clinical Center
University of Michigan at Ann Arbor
FY2015$43,950U01DK073985 - Gastroparesis Clinical Research Consortium-University of Michigan Clinical Center
University of Michigan at Ann Arbor
FY2014$117,623U01DK073985 - Gastroparesis Clinical Research Consortium-University of Michigan Clinical Center
University of Michigan at Ann Arbor
FY2013$112,759U01DK073985
Awards in the NIH RePORTER records where a principal investigator name matches this physician at an organization in their practice state. Latest award years shown; each row links to the project record on RePORTER.
Publications
Matched to this physician's OpenAlex author record; most-cited works shown first.
- Mast cell mediation of visceral sensation and permeability in irritable bowel syndrome
Neurogastroenterology & Motility
2022 - Role of chronic cannabis use: Cyclic vomiting syndrome vs cannabinoid hyperemesis syndrome
Neurogastroenterology & Motility
2019
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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.”