Gerry Mullin
Experienced in Bowel Incontinence

Dr. Gerry Mullin

Gastroenterology
Johns Hopkins Medicine
JH Health Care & Surgery Center – White Marsh
4924 Campbell Boulevard, Suite 110, Suite 110, 
Nottingham, MD 
Offers Telehealth

Experienced in Bowel Incontinence
Johns Hopkins Medicine
JH Health Care & Surgery Center – White Marsh
4924 Campbell Boulevard, Suite 110, Suite 110, 
Nottingham, MD 
OverviewInsuranceLocationsClinical ResearchSimilar Doctors

Overview

Dr. Mullin is an associate professor of medicine at The Johns Hopkins University School of Medicine. Dr. Mullin has more than 30 years of clinical experience in the field of general gastroenterology. Dr. Mullin is a reviewer and also serves on the editorial board of numerous gastroenterology journals. Videos Hopkins at Home presents, A Woman's Journey: Is It Celiac Disease?.

Dr. Mullin is rated as an Experienced provider by MediFind in the treatment of Bowel Incontinence. His top areas of expertise are Small Bowel Bacterial Overgrowth, Irritable Bowel Syndrome (IBS), Diarrhea, Endoscopy, and Colonoscopy.

His clinical research consists of co-authoring 93 peer reviewed articles. MediFind looks at clinical research from the past 15 years.

Residency
Mount Sinai Hospital, Medicine, 1988
Specialties
Gastroenterology
Licenses
Internal Medicine in MD
Board Certifications
American Board Of Internal Medicine
Fellowships
University of Arizona Medical Center, Integrative Medicine, 2008
Johns Hopkins University School of Medicine, Gastroenterology, 1991
Hospital Affiliations
The Johns Hopkins Hospital
Johns Hopkins Bayview Medical Center
Languages Spoken
English
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
  • MEDICARE PDP
  • MEDICARE-MEDICAID PLAN
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
Capital Blue Cross
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • OTHER MEDICARE PART D
  • PPO
CareFirst
  • HMO
  • POS
  • PPO
Cigna
  • EPO
  • HMO
  • PPO
First Health
  • INSURANCE PLAN
  • MEDICARE PDP
  • PPO
Geisinger
  • HMO
  • POS
  • PPO
Health Care Services Corporation
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • OTHER COMMERCIAL
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
  • PPO
Highmark
  • EPO
  • HMO
  • PPO
Humana
  • HMO
  • INDEMNITY
  • POS
  • PPO
Independent Health
  • EPO
  • POS
  • PPO
Johns Hopkins Healthcare
  • HMO
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE-MEDICAID PLAN
Managed Medicaid
  • OTHER MANAGED MEDICAID
Medicaid
  • OTHER MEDICAID
  • STATE MEDICAID
TeamCare
  • OTHER COMMERCIAL
UnitedHealthcare
  • EPO
  • HMO
  • POS
  • PPO
Wellcare
  • EPO
  • HMO
  • INSURANCE PLAN
  • MANAGED MEDICAID PLAN
  • MEDICARE MAPD
  • MEDICARE PDP
  • MEDICARE SNP
  • MEDICARE-MEDICAID PLAN
  • OTHER MEDICARE
  • OTHER MEDICARE PART D
View 14 Less Insurance Carriers -

Locations

JH Health Care & Surgery Center – White Marsh
4924 Campbell Boulevard, Suite 110, Suite 110, Nottingham, MD 21236
Call: 410-933-7495

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.


93 Total Publications

Improved Survival in Malnourished COVID-19 Inpatients with Oral Nutrition Supplementation.
Improved Survival in Malnourished COVID-19 Inpatients with Oral Nutrition Supplementation.
Journal: Nutrients
Published: June 06, 2025
View All 93 Publications
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Woodholme Gastroenterology Assoc PA

1838 Greene Tree Road, Suite 400, Suite 400, 
Baltimore, MD 
 (9.0 miles away)
410-602-7782
Languages Spoken:
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See accepted insurances
Offers Telehealth

Dr. Onwueme graduated with Distinction from Yale University with dual BSc/MSc degrees in chemistry and received MD and PhD degrees from Weill Cornell Medical College. He completed his Internal Medicine residency at Brigham and Women’s Hospital (Clinical Fellow Harvard Medical School) and his Gastroenterology fellowship at Johns Hopkins University School of Medicine. He is currently the Director of clinical trials at Woodholme Gastroenterology and has an ardent interest in the role of microbial metabolites in gut diseases. Dr. Onwueme prizes commitment to quality and compassionate patient care to which he devotes his practice. He has expert knowledge in gut microbiology and a special interest in diarrheal diseases, disordered gut motility, autoimmune and inflammatory bowel disease. Dr. Onwueme is rated as an Advanced provider by MediFind in the treatment of Bowel Incontinence. His top areas of expertise are Gastric Dysmotility, Diverticular Disease, Diarrhea, Endoscopy, and Gastrectomy.

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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. Mullin's expertise for a condition
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    • Distinguished
    • Small Bowel Bacterial Overgrowth
      Dr. Mullin is
      Distinguished
      . Learn about Small Bowel Bacterial Overgrowth.
      See more Small Bowel Bacterial Overgrowth experts
    • Advanced
    • Colitis
      Dr. Mullin is
      Advanced
      . Learn about Colitis.
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    • Colonoscopy
      Dr. Mullin is
      Advanced
      . Learn about Colonoscopy.
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    • Crohn's Disease
      Dr. Mullin is
      Advanced
      . Learn about Crohn's Disease.
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    • Diarrhea
      Dr. Mullin is
      Advanced
      . Learn about Diarrhea.
      See more Diarrhea experts
    • Endoscopy
      Dr. Mullin is
      Advanced
      . Learn about Endoscopy.
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    • Gas Bloat Syndrome
      Dr. Mullin is
      Advanced
      . Learn about Gas Bloat Syndrome.
      See more Gas Bloat Syndrome experts
    View All 11 Advanced Conditions
    • Experienced
    • Angiodysplasia of the Colon
      Dr. Mullin is
      Experienced
      . Learn about Angiodysplasia of the Colon.
      See more Angiodysplasia of the Colon experts
    • Bowel Incontinence
      Dr. Mullin is
      Experienced
      . Learn about Bowel Incontinence.
      See more Bowel Incontinence experts
    • Celiac Disease
      Dr. Mullin is
      Experienced
      . Learn about Celiac Disease.
      See more Celiac Disease experts
    • Childhood Volvulus
      Dr. Mullin is
      Experienced
      . Learn about Childhood Volvulus.
      See more Childhood Volvulus experts
    • Chronic Erosive Gastritis
      Dr. Mullin is
      Experienced
      . Learn about Chronic Erosive Gastritis.
      See more Chronic Erosive Gastritis experts
    • Colonic Malakoplakia
      Dr. Mullin is
      Experienced
      . Learn about Colonic Malakoplakia.
      See more Colonic Malakoplakia experts
    View All 32 Experienced Conditions
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