John Leung
Elite in Eosinophilic Esophagitis

Dr. John Leung

Allergy and Immunology
Boston Specialists
75 Kneeland St, Floor 1, 
Boston, MA 
On Staff At
Clinical Trials:Currently Recruiting for 1 Trial
Accepting New Patients
Offers Telehealth
22 Years of Experience

Elite in Eosinophilic Esophagitis
Boston Specialists
75 Kneeland St, Floor 1, 
Boston, MA 
OverviewInsuranceLocationsClinical ResearchSimilar Doctors

Overview

John Leung, MD, AGAF, FACAAI is the only US physician dual board certified in Allergy/Immunology and Gastroenterology. He attended medical school at University of Michigan Medical School and completed his internal medicine residency at University of Iowa Hospitals and Clinics. He then proceeded with a Gastroenterology fellowship at Tufts Medical Center and an Allergy/Immunology fellowship at Massachusetts General Hospital/Harvard Medical School. He began his early career in academia working on several NIH-funded research projects.He is a former site principal investigator of the Consortium of Eosinophilic Gastrointestinal Disease Researchers (CEGiR). He established and directed the Center for Food Related Diseases at Tufts Medical Center and the Pediatric Food Allergy Center at Tufts Children’s Hospital.

In 2015, Dr. Leung founded Boston Specialists/Boston Food Allergy Center. The center has become one of the most distinguished independent clinical and research centers in New England, treating 250-300 patients per week. He has conducted over 40 industry and federally funded clinical trials since 2010. He is currently an adjunct assistant professor at Tufts Friedman School of Nutrition Science and Policy, and an adjunct faculty member of the Immunology Program at Tufts Graduate School of Biomedical Sciences. Both his clinical and research focus are on eosinophilic gastrointestinal diseases, mast cell GI disorders and food allergy/intolerance. He has co-authored more than 50 peer-reviewed manuscripts including an article in New England Journal of Medicine, numerous scientific abstracts, book chapters, and online tutorials. He has been invited to lecture at many well-renowned institutions, some of which include Tufts Medical School, Massachusetts General Hospital, Brigham and Women’s Hospital, Beth Israel Deaconess Medical Center, Massachusetts Medical Society, and the American Gastroenterology Association.

Dr. Leung is rated as an Elite provider by MediFind in the treatment of Eosinophilic Esophagitis. His top areas of expertise are Eosinophilic Esophagitis, Eosinophilic Enteropathy, Eosinophilic Colitis, Endoscopy, and Tissue Biopsy.

His clinical research consists of co-authoring 79 peer reviewed articles and participating in 10 clinical trials. MediFind looks at clinical research from the past 15 years. In particular, he has co-authored 45 articles and participated in 8 clinical trials in the study of Eosinophilic Esophagitis.

Graduate Institution
University Of Michigan Medical School, 2004
Residency
University of Iowa Hospitals and Clinics
Specialties
Allergy and Immunology
Licenses
Medical License in MA
Medical License in ME
Medical License in NH
Board Certifications
Gastroenterology
Allergy And Immunology
Fellowships
Gastroenterology
Allergy and Immunology
Hospital Affiliations
Beth Israel Deaconess Needham
Beth Israel Deaconess Milton
Mount Auburn Hospital
St. Elizabeth’s Medical Center
Mass General Brigham Newton-Wellesley Hospital
Languages Spoken
English
Cantonese
Mandarin
Gender
Male

Insurance

Accepted insurance can change. Please verify directly with the provider.

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Accepted insurance plans:

Aetna
  • EPO
  • HMO
  • POS
  • PPO
Anthem
  • EPO
  • HMO
  • POS
  • PPO
Blue Cross Blue Shield
  • EPO
  • HMO
  • POS
  • PPO
Blue Shield of California
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
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  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
BMC HealthNet
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  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
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Buckeye Health Plan
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE-MEDICAID PLAN
Cambia Health Solutions
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  • INSURANCE PLAN
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  • OTHER MEDICARE
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Capital District Physicians Health
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CareFirst
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Cigna
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Commonwealth Care Alliance
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Health Care Services Corporation
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HealthPartners
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Oscar
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Spectrum Priority Health
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Sutter Health
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Tufts
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UnitedHealthcare
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Walgreens
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Wellcare
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View 35 Less Insurance Carriers -

Locations

Boston Specialists
75 Kneeland St, Floor 1, Boston, MA 02111
Call: 617-804-6767

Additional Areas of Focus

Dr. Leung has provided the following conditions as areas of focus. Please note that we may not have enough data to validate their experience in some of these conditions.

Eosinophilic Esophagitis
Food Allergy
Malabsorption

Clinical Research

Clinical research consists of overseeing clinical studies of patients undergoing new treatments and therapies, and publishing articles in peer reviewed medical journals. Providers who actively participate in clinical research are generally at the forefront of the fields and aware of the most up-to-date advances in treatments for their patients.


10 Clinical Trials

A Prospective, Multicenter Study to Compare and Validate Endoscopic, Histologic, Molecular, and Patient-Reported Outcomes in Pediatric and Adult Patients With Eosinophilic Esophagitis (EoE), Gastritis (EoG), Enteritis (EoN) and Colitis (EoC)
A Prospective, Multicenter Study to Compare and Validate Endoscopic, Histologic, Molecular, and Patient-Reported Outcomes in Pediatric and Adult Patients With Eosinophilic Esophagitis (EoE), Gastritis (EoG), Enteritis (EoN) and Colitis (EoC)
Enrollment Status: Recruiting
Publish Date: September 12, 2025
A Randomized, Double-blind, Placebo-controlled Clinical Trial to Evaluate the Efficacy of Dupilumab (Anti-IL4a) in Subjects With Eosinophilic Gastritis
A Randomized, Double-blind, Placebo-controlled Clinical Trial to Evaluate the Efficacy of Dupilumab (Anti-IL4a) in Subjects With Eosinophilic Gastritis
Enrollment Status: Completed
Publish Date: November 04, 2025
Intervention Type: Drug
Study Drug: Dupilumab
Study Phase: Phase 2
A Phase 3, Multicenter, Open-label Continuation Study With Budesonide Oral Suspension (BOS) for Adolescent and Adult Subjects With Eosinophilic Esophagitis (EoE)
A Phase 3, Multicenter, Open-label Continuation Study With Budesonide Oral Suspension (BOS) for Adolescent and Adult Subjects With Eosinophilic Esophagitis (EoE)
Enrollment Status: Terminated
Publish Date: February 19, 2025
Intervention Type: Drug
Study Drug: Budesonide oral suspension
Study Phase: Phase 3
A Phase 3, Multicenter, Double-blind Extension Study to Evaluate Maintenance of Efficacy of Oral Budesonide Suspension (OBS) and Long-term Treatment Effect of OBS in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis (EoE)
A Phase 3, Multicenter, Double-blind Extension Study to Evaluate Maintenance of Efficacy of Oral Budesonide Suspension (OBS) and Long-term Treatment Effect of OBS in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis (EoE)
Enrollment Status: Completed
Publish Date: February 19, 2025
Intervention Type: Drug
Study Phase: Phase 3
Oral Budesonide Suspension (OBS) in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis: A Phase 3 Randomized, Double-blind, Placebo-controlled Study
Oral Budesonide Suspension (OBS) in Adolescent and Adult Subjects (11 to 55 Years of Age, Inclusive) With Eosinophilic Esophagitis: A Phase 3 Randomized, Double-blind, Placebo-controlled Study
Enrollment Status: Completed
Publish Date: February 19, 2025
Intervention Type: Drug
Study Phase: Phase 3
A Phase 2, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy, Safety, Tolerability, and Pharmacodynamic Effect of AK002 in Patients With Eosinophilic Gastritis and/or Eosinophilic Gastroenteritis
A Phase 2, Multicenter, Randomized, Double-Blind, Placebo-Controlled Study to Evaluate the Efficacy, Safety, Tolerability, and Pharmacodynamic Effect of AK002 in Patients With Eosinophilic Gastritis and/or Eosinophilic Gastroenteritis
Enrollment Status: Completed
Publish Date: January 19, 2024
Intervention Type: Other, Drug
Study Phase: Phase 2
Demographics, Clinical Characteristics, and Pathology of Eosinophilic Gastritis, Enteritis, and Colitis in a Multi-Site Cohort
Demographics, Clinical Characteristics, and Pathology of Eosinophilic Gastritis, Enteritis, and Colitis in a Multi-Site Cohort
Enrollment Status: Completed
Publish Date: September 28, 2021
Oral Budesonide Suspension (OBS) in Adolescent and Adult Subjects (11-40 Years of Age)With Eosinophilic Esophagitis: A Phase II, Randomized, Double-Blind, Placebo-Controlled Study With an Open Label Extension
Oral Budesonide Suspension (OBS) in Adolescent and Adult Subjects (11-40 Years of Age)With Eosinophilic Esophagitis: A Phase II, Randomized, Double-Blind, Placebo-Controlled Study With an Open Label Extension
Enrollment Status: Completed
Publish Date: June 08, 2021
Intervention Type: Drug
Study Phase: Phase 2
Six Food vs One Food Eosinophilic Esophagitis Elimination Diet (SOFEED) Followed by Swallowed Glucocorticoid Trial
Six Food vs One Food Eosinophilic Esophagitis Elimination Diet (SOFEED) Followed by Swallowed Glucocorticoid Trial
Enrollment Status: Completed
Publish Date: May 26, 2020
Intervention Type: Other, Drug
Study Phase: Phase 2/Phase 3
An Exploratory Pilot Study Evaluating Various Diagnostic Measurements Taken During an Escalating Dose Oral Food Challenge to Patient Response
An Exploratory Pilot Study Evaluating Various Diagnostic Measurements Taken During an Escalating Dose Oral Food Challenge to Patient Response
Enrollment Status: Completed
Publish Date: October 02, 2018
View 9 Less Clinical Trials

79 Total Publications

Dupilumab for Adult and Adolescent Patients With Primary Eosinophilic Colitis.
Dupilumab for Adult and Adolescent Patients With Primary Eosinophilic Colitis.
Journal: Clinical and translational gastroenterology
Published: June 03, 2025
View All 79 Publications
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Areas of Expertise

MediFind evaluates expertise by pulling from factors such as number of articles a doctor has published in medical journals, participation in clinical trials, speaking at industry conferences, prescribing and referral patterns, and strength of connections with other experts in their field.

Learn more about MediFind’s expert tiers

Find Dr. Leung's expertise for a condition
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  • Elite
  • Eosinophilic Esophagitis
    Dr. Leung is
    Elite
    . Learn about Eosinophilic Esophagitis.
    See more Eosinophilic Esophagitis experts
  • Distinguished
  • Eosinophilic Colitis
    Dr. Leung is
    Distinguished
    . Learn about Eosinophilic Colitis.
    See more Eosinophilic Colitis experts
  • Eosinophilic Enteropathy
    Dr. Leung is
    Distinguished
    . Learn about Eosinophilic Enteropathy.
    See more Eosinophilic Enteropathy experts
  • Advanced
  • Asthma
    Dr. Leung is
    Advanced
    . Learn about Asthma.
    See more Asthma experts
  • Mast Cell Activation Syndrome (MCAS)
    Dr. Leung is
    Advanced
    . Learn about Mast Cell Activation Syndrome (MCAS).
    See more Mast Cell Activation Syndrome (MCAS) experts
  • Experienced
  • Allergic Conjunctivitis
    Dr. Leung is
    Experienced
    . Learn about Allergic Conjunctivitis.
    See more Allergic Conjunctivitis experts
  • Allergic Rhinitis
    Dr. Leung is
    Experienced
    . Learn about Allergic Rhinitis.
    See more Allergic Rhinitis experts
  • Anaphylaxis
    Dr. Leung is
    Experienced
    . Learn about Anaphylaxis.
    See more Anaphylaxis experts
  • Angioedema
    Dr. Leung is
    Experienced
    . Learn about Angioedema.
    See more Angioedema experts
  • Colonoscopy
    Dr. Leung is
    Experienced
    . Learn about Colonoscopy.
    See more Colonoscopy experts
  • Conjunctivitis (Pink Eye)
    Dr. Leung is
    Experienced
    . Learn about Conjunctivitis (Pink Eye).
    See more Conjunctivitis (Pink Eye) experts
View All 13 Experienced Conditions
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