Mike Leonis, MD, PhD
Primary Location
Cleveland Clinic Main Campus
- Appointment:
- 216.444.5437
- Desk:
- 216.445.5839
- Fax:
- 216.444.2974
Additional Locations
Pediatric Gastroenterology, Hepatology, and Nutrition
Hillcrest Medical Building 2
6801 Mayfield Road
Mayfield Heights, OH 44124
Directions
- Appointment:
- 216.444.5437
- Desk:
- 216.445.5839
- Fax:
- 216.444.2974
Pediatric Gastroenterology, Hepatology, and Nutrition
Mentor Medical Office Building
7060 Wayside Drive
Mentor, OH 44060
Directions
- Appointment:
- 216.444.5437
- Desk:
- 216.445.5839
- Fax:
- 216.444.2974
Pediatric Gastroenterology, Hepatology, and Nutrition
Solon Family Health Center
29800 Bainbridge Road
Solon, OH 44139
Directions
- Appointment:
- 216.444.5437
- Desk:
- 216.445.5839
- Fax:
- 216.444.2974
Pediatric Gastroenterology, Hepatology, and Nutrition
Akron General Health Center
676 South Broadway St.
Akron, OH 44311
Directions
- Appointment:
- 216.444.5437
- Desk:
- 216.445.5839
- Fax:
- 216.444.2974
Treatment & Services
- Care of Liver Related Metabolic Problems
- Care of Liver Transplant Patients
- Center for Pediatric Gastroenterology
- Liver Biopsy
- Liver Transplant
- Pediatric Liver Transplant
Specialty in Diseases & Conditions
- Achalasia
- Acute Liver Failure
- Biliary Atresia
- Cirrhosis
- Diseases of the Liver, Biliary Tract and Pancreas
- Gallbladder Disease
- Gallstones
- Hepatitis B
- Hepatitis C
- Liver Disease
- Metabolic Diseases
- Mitochondrial Disease
- Non-Alcoholic Fatty Liver Disease
- Primary Sclerosing Cholangitis
Insurance
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Read an article: The Search for Biomarkers to Aid in the Diagnosis and Treatment of Pediatric Acute Liver Failure
Read an article: Nonalcoholic Fatty Liver Disease: A Continuing Challenge
Listen to a podcast: Acute Liver Failure Diagnosis and Treatment in Pediatric Patients
Education & Professional Highlights
Appointed
2020
Education & Fellowships
Fellowship - Cincinnati Children's Hospital
Pediatric Gastroenterology
Cincinnatii,
OH
2002
Residency - University of Utah Medical Center
Pediatrics
Salt Lake City,
UT
1999
Graduate School - Washington University
Ph.D. in Molecular Biology
St. Louis,
MO
1996
Medical Education - Washington University in St. Louis
MD/PhD combined program
St. Louis,
1996
Undergraduate - Washington University in St. Louis
Biochemistry
St. Louis,
MO
1987
Certifications
- Pediatrics - Pediatric Gastroenterology
- Pediatrics - Pediatric Transplant Hepatology
Research & Publications
See publications for Mike Leonis, MD, PhD.
(Disclaimer: This search is powered by PubMed, a service of the U.S. National Library of Medicine. PubMed is a third-party website with no affiliation with Cleveland Clinic.)
Industry Relationships
Cleveland Clinic physicians and scientists may collaborate with the pharmaceutical or medical device industries to help develop medical breakthroughs or provide medical expertise or education. Cleveland Clinic strives to make scientific advances that will benefit patient care and support outside relationships that promise public benefit. In order for the discoveries of Cleveland Clinic physicians' and scientists' laboratories and investigations to benefit the public, these discoveries must be commercialized in partnership with industry. As experts in their fields, Cleveland Clinic physicians and scientists are often sought after by industry to consult, provide expertise and education.
To assure professional and commercial integrity in such matters, Cleveland Clinic maintains a program that reviews these collaborations and, when appropriate, puts measures in place to minimize bias that may result from ties to industry. Cleveland Clinic publicly discloses the names of companies when (i) its physicians/scientists receive $5,000 or more per year (or, in rare cases, equity or stock options) for speaking and consulting, (ii) its physicians/scientists serve as a fiduciary, (iii) its physicians/scientists receive or have the right to receive royalties or (iv) its physicians/ scientists hold any equity interest for the physician's/scientist's role as inventor, discoverer, developer, founder or consultant.* In publicly disclosing this information, Cleveland Clinic tries to provide information as accurately as possible about its physicians' and scientists' connections with industry.
As of 4/21/2025, Dr. Leonis has reported no financial relationship with industry that is applicable to this listing. In general, patients should feel free to contact their doctor about any of the relationships and how the relationships are overseen by Cleveland Clinic. To learn more about Cleveland Clinic's policies on collaborations with industry and innovation management, go to our Integrity in Innovation page.
Public Health Service-Reportable Financial Conflicts of Interest. Cleveland Clinic scientists and physicians engage in basic, translational and clinical research activities, working to solve health problems, enhance patient care and improve quality of life for patients. Interactions with industry are essential to bringing the researchers' discoveries to the public, but can present the potential for conflicts of interest related to their research activities. Click here to view a listing of instances where Cleveland Clinic has identified a Public Health Service (PHS)-Reportable Financial Conflict of Interest and has put measures in place to ensure that, to the extent possible, the design, conduct and reporting of the research is free from bias.
* Cleveland Clinic physicians and scientists subscribe to the guidance presented in the PhRMA Code on Interactions with Healthcare Professionals and the AdvaMed Code of Ethics on Interactions with Health Care Professionals. As such, gifts of substantial value are generally prohibited.