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About Dr. Nguyen

Dr. Katrina Nguyen is a board certified pediatric gastroenterologist. Following the completion of her medical degree from the American University of the Caribbean School of Medicine in 2002, Dr. Nguyen completed her residency in internal medicine-pediatrics at the University of Missouri in Columbia, followed by her fellowship in pediatric gastroenterology, hepatology and nutrition at SUNY Downstate Medical Center in Brooklyn, New York.

She worked at Augusta University in Georgia from August 2009 to May 2013 following completion of her fellowship. After that, she worked at Mercyhealth in Illinois from July 2013 until July 2020, serving patients in northern Illinois and southern Wisconsin. She is currently a locum tenens physician.

Alongside her clinical role at Mercyhealth, Dr. Nguyen served as a Clinical Associate Professor of Pediatrics at the University of Illinois College of Medicine in Rockford. She is the founder of Faithful-2-Fitness, a nonprofit organization whose mission is to reverse the childhood obesity epidemic in America. She is a member of the Catholic Medical Association and the North American Society for Pediatric Gastroenterology, Hepatology and Nutrition.

Licensed States

Illinois, Wisconsin, Connecticut, Colorado, Telehealth Only in Kansas, Florida, and Minnesota

In-Network Carriers

Medicare, Blue Cross Blue Shield, Cigna, UnitedHealthcare, TriCare Select, ProviDrs Care

Blue Cross Blue Shield Networks Include: PPO, Blue Choice PPO, BCE, and BCO), Blue Cross Medicare Advantage Flex Plans (PPO & HMO), BCBS Federal Employee Program PPO (FEP)

United Healthcare Networks Include: PPO, Nexus (OAP, RB, RP, OAP, NRP, R, NR, NRB, OA), Charter (HMO, EPO, POS), Navigate (Plus), Core (EPO, HMO, Choice Plus POS), Choice (HMO, Plus HMO, Plus POS, EPO), Surest Plan, Select (Plus POS), Doctors Plan (Plus POS, Plus HMO, EPO), Select (HMO, Plus), Medicare Advantage

Accepts those who are insured with:
Christian Brothers Ministry Services Plan
Diocese of Saint Petersburg, Florida
Christendom College

Services Offered

  • Care for children up to 21 years old with chronic abdominal pain, Irritable bowel syndrome inflammatory bowel disease, celiac disease, eosinophilic esophagitis, GERD, liver disease, obesity, food allergies, constipation, encopresis, feeding difficulties, feeding tubes and much more.


Dr. Nguyen provides consultation for patients from birth to 21 years old via virtual visits.
*Languages: English