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Dr. Mitchell H. Katz, Pediatric Gastroenterology

An internationally-recognized expert in pediatric gastroenterology, Dr. Katz serves as director of CHOC Children’s Multidisciplinary Feeding Program, pediatric gastrointestinal lab services, and the division of pediatric gastroenterology and nutrition.

On the forefront of pediatric gastroenterology research and innovative treatments, Dr. Katz and his team are involved in a number of clinical trials testing medications for inflammatory bowel disease and gastroesophageal reflux disease (GERD). He serves as principal investigator in three studies testing new drugs for treating children and adolescents with Crohn’s disease. He is conducting studies of single- and multiple-day doses of rabeprazole sodium in neonates and preterm infants with corrected ages of less than 44 weeks who have presumptive diagnosis of GERD.

A sought-after expert in his field, Dr. Katz has been invited to give talks at professional meetings and has been published in numerous journals, including Pediatric Infectious Disease and Gastro Endoscopy.

Dedicated to clinical excellence, Dr. Katz is board certified in pediatrics and pediatric gastroenterology. He earned his medical degree from State University of New York at Downstate Medical School. He completed his internship and residency at Mt. Sinai Hospital and served his fellowship in pediatric gastroenterology and nutrition at the University of California, San Francisco.  Dr. Katz is consistently voted as one of Orange County’s Top Doctors by the Orange County Medical Association.

Research Focus

Inflammatory bowel disease and gastroesophageal reflux, Crohn's disease


CHOC Children’s Clinic
1201 W. La Veta Ave.
Building: CHOC Clinic
Orange, CA 92868
phone: 888-770-2462
fax: 855-246-2329

2801 Atlantic Avenue
Long Beach, CA 90801
phone: (562) 933-3009
fax: (562) 933-8569

CHOC Children’s Specialty Center – Newport Beach
500 Superior Ave 140
Newport Beach, CA 92663

Orange Coast Memorial
9920 Talbert Ave
Fountain Valley, CA 92708

Fountain Valley Regional Medical Center
17100 Euclid St
Fountain Valley, CA 92708

Saddleback Memorial Medical Center
24451 Health Center Dr
Laguna Hills, CA 92653

CHOC Children’s at Mission Hospital
27700 Medical Center Rd
Mission Viejo, CA 92691

St Joseph Hospital
1100 W Stewart Dr
Orange, CA 92868

Western Medical Center
1001 N Tustin Ave
Santa Ana, CA 92705

11100 Warner Ave. 368
Fountain Valley, CA 92708

CHOC Children’s Health Center – Mission Viejo
26691 Plaza Suite 130
Mission Viejo, CA 92691

Batavia Woods Medical Center
725 W. La Veta Ave. 100
Orange, CA 92868

CHOC Children’s Specialists Otolaryngology
1010 W. La Veta Ave. 640
Orange, CA 92868

Our gastroenterologists commonly treat:

  • Mitchell H Katz MD
    • Appointments:
    • Office: 714-509-4099
    • Specialty: Gastroenterology
    • Board Certified: Pediatrics, Pediatric Gastroenterology
    • On Staff at: CHOC Children's Hospital and CHOC Children's at Mission Hospital

More About Dr. Katz

Clinical Professor, Department of Pediatrics, UC Irvine
Director, Feeding Program, CHOC Children’s
Director, Pediatric GI Lab Services, CHOC Children’s
Co-Director, Eosinophilic Esophagitis Clinic, CHOC Children’s
Division Chief, Gastroenterology, CHOC Children’s Specialists
Director, Ambulatory Network Development, CHOC Children's Specialists
Chief Resident, Department of Pediatrics
Mt. Sinai Hospital, New York

Fellow, Ambulatory Pediatrics
Mt. Sinai Hospital, New York

Medical School
SUNY at Downstate Medical School, New York

Pediatric Gastroenterology and Nutrition Fellowship
University of California San Francisco

Pediatric Residency
Mt. Sinai Hospital, New York

Residency, Department of Pediatrics
Mt. Sinai Hospital, New York
APGNN Excellence in Mentoring Award
The Association of Pediatric Gastroenterology and Nutrition Nurses 2011

Physician of Excellence, Orange County Medical Association
Multiple years

USNWR Best Children’s Hospital Gastroenterology Division
U.S. News & World Report Magazine, multiple years
Constipation in Infants and Adolescents
Grand Rounds CHOC Children’s, Orange California, Nov 09, 2011

Constipation in Infants and Adolescents
Grand Rounds, HOC Childrens , Mission Viejo Ca, June 15, 2011

GI Complication S/P BNT Transplantation
Lecture to BMT RN’s, CHOC Children’s, Orange, California, May 18, 2012

GI Complication S/P BNT Transplantation
Lecture to BMT RN’s, CHOC Children’s, Orange, California, Nov 4, 2011

Management of Feeding Problems in the Primary Care Setting
Grand Rounds, CHOC Children’s, Orange, California, June 13, 2012

Managing Complex Feeding Disorders
Grand Rounds, CHOC Children’s Hospital, Orange Ca, April 13, 2011

Multidisciplinary Feeding Program
Division of Pediatric Gastaroenterology, Hepatology and Nutrition, Lucile Packard Children’s Hospital/Stanford University Medical Center, Feb 3, 2012

Multidisciplinary Feeding Program
Division of Pediatric Gastaroenterology, Hepatology and Nutrition, University of California San Francisco, San Francisco,California, Feb 2, 2012

Neonatal Cholestasis
Lecture to Residents, CHOC Children’s, Orange, California, April 10, 2012

Pancreatic Disorders
Lecture to Residents, CHOC Children’s, Orange, California, October 9, 2012

Pediatric GI for the Adult Gastroenterologist
GI Fellow Lecture, UCI Medical School, Irvine Ca, Feb. 23, 2011

Pediatric Parental Nutrition
Grand Rounds, CHOC Children’s Orange, California, Sept 21, 2011

Touch Stones & Family Centered Care
Grand Rounds, CHOC Children’s, Orange California, March 21, 2012

Touch Stones & Family Centered Care
Lecture to Residents, CHOC Children’s, Orange California, April 20, 2012

Update on GERD in Adolescents/Celiac Disease in Children
Annual Pediatric Symposium, Children’s Hospital of Orange County, California, May 1, 2009
American Academy of Pediatrics, Gastroenterology/Nutrition
American Gastroenterology Association
Orange County Medical Association
Chuang MH, Singh J, Ashouri N, Katz MH, Arrieta AC. Listeria meningitis after infliximab treatment of ulcerative colitis. J Pediatr Gastroenterology Nutr. 2010, Mar;50(3):337-9.

Ward RM, Kearns GL, Tammara B, Bishop P, O’Gorman MA, James LP, Katz MH, Maquire MK, Rath N, Meng X, Comer GM. A multicenter, randomized, open-label, pharmacokinetics and safety study of pantoprazole tablets in children and adolescents aged 6 through 16 years with gastroesophageal reflux disease. J Clin Pharmacol. 2011 Jun;51(6):876-87, Epub Sep 17 2010. 15 Mitchell Katz, MD

W. Robinson, Robyn, NP, Katz, Mitchell, MD, Kim, Cindy, PhD. The Effect of Feeding on Quality of Life. Poster presentation National Assoications of Pediatric Nurse Practitioners, March 22-26, 2011, Baltimore, Maryland.

Katz, Mitchell, MD, Robinson, Robyn, CPNP. Quality of Life Changes Following an Intensive Feeding Program. Poster presentation North American Society for Pediatric Gastroenterology, Hepatology and Nutrition, National Conference October 19-22, 2011, Orlando Florida

Katz, Mitchell,MD, Brown, Jessica, RD, Kim, Cindy, PhD Successful Gastrostomy Feed Weaning Program Using An Intensive Multidisciplinary Team Approach, CHOC Children’s, Orange, CA. Poster presentation North American Society for Pediatric Gastroenterology, Hepatology and Nutrition, National Conference Oct 18-21, 2012.

Lauridson, Sarah, MS CCC-SLP, Katz, Mitchell,MD,. CHOC Children’s, Orange, CA. Non Surgical Management of Dysphagia, Secondary to Cricopharyngeal Achalasia In Infants. Poster presentation North American Society for Pediatric Gastroenterology, Hepatology and Nutrition, National Conference Oct 18-21, 2012. Revised Nov 2012


Feeding Program-Dr. Katz

Feeding Program: Dr. Katz

Gaining or re-gaining the abiltiy to eat is a major milestone for a child and their family. Mitchell Katz, MD, talks to us about CHOC's feeding program.

Dr. Katz - There's No Place Like CHOC

There’s No Place Like CHOC: Dr. Katz

Mitchell Katz, MD, Medical Director of Specialty Ambulatory Care Services, tells us why he loves working at CHOC & providing care for patients and families.

Gastro Intestinal Problems-Dr. Katz

Gastro Intestinal Problems: Dr. Katz

Gastro intestinal problems can occur at any age, even in children. Mitchell Katz, MD, at CHOC Children's, tells us about these problems in children.

CHOC Feeding Program - Pacer's Story

CHOC Patient Pacer

CHOC patient Pacer was only able to eat 5% of his nutrition by mouth and had been fed by a feeding tube for most of his life.



Dr. Mitchell Katz Talks about Stomach Pain in Children

CHOC Pediatric Gastroenterologist Dr. Mitchell Katz talks with CHOC Radio host Bryan Mundia about the symptoms of stomach aches and pains in children.

Health Topics


Chronic Constipation in Kids

Constipation is a common problem that can make kids - and their parents - miserable. Learn about the treatments for chronic constipation in this health feature.


Kids and Stomachaches

Stomachaches are very common and there are many causes, but the majority of kids with abdominal pain do not require urgent intervention.

More About Dr. Katz and Gastroenterology

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UC Irvine

CHOC Children's is affiliated with the UC Irvine School of Medicine