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Internist, Gastroenterologist (digestive)
28 years of experience
Accepting new patients
License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

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Specialties & Research

Dr. William Hasler, MD is board certified in Internal Medicine and Gastroenterology.

  • He has special expertise in 11 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Capsule Endoscopy
  • Constipation
  • Esophageal Motility Disorders (Dysmotilities)
  • Functional Colonic Diseases (Functional Bowel Disorders)
  • Gastrointestinal Diseases (GI Diseases)
  • Gastroparesis
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Stomach Diseases
  • Ulcerative Colitis

Education & Awards

Dr. Hasler graduated from University of Pennsylvania , Philadelphia. He has 2 awards.

One of America's Leading Experts on:
Stomach Diseases


Dr. Hasler has 2 hospital affiliations:

  • University of Michigan Hospitals & Health Centers 
  • Ann Arbor Veterans Affairs Medical Center 

> > > > Dr. William Hasler, MD

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Additional Information
Dr. William Hasler MD is a male Internist, has 28 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. William Hasler practice?
Dr. William Hasler has 5 office locations.
Dr. William Hasler practices Internal Medicine and Gastroenterology near Livonia, MI.
Additional practice locations include: Ann Arbor, MI and Ypsilanti, MI.
See Livonia Internists and Livonia Gastroenterologists.