Katrina Nguyen, M.D.

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.

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.

Illinois, Wisconsin, Connecticut, Colorado, Kansas (Telehealth Only), Florida (Telehealth Only), and Minnesota

Insurance Network Participation

• Aetna (Effective March 10, 2026)
• Blue Cross Blue Shield
• Cigna
• Curative
• Medicare
• ProviDrs Care
• TRICARE East — Select Plans Only (Non-Network Certified, Effective 2025)
• UnitedHealthcare

Insurance Disclaimer

Insurance participation varies by specific plan, product, and network. Patients are responsible for confirming their provider’s network participation and benefits directly with their insurance plan.

If this clinician is licensed in your state they are able to accept your insurance if you are insured by any one of the following:
Archdioceses of Denver, Archdiocese of Kansas City in Kansas, Catholic Diocese of Arlington, Virginia, Catholic Diocese Of Wichita, Kansas, Christ in the City, Christendom College, Christian Brothers Ministry Services Plan, Diocese of Saint Petersburg, Florida, Dyna Parts, EWTN, Hallow, Medi-Share, Reta Trust-Kaiser (NFP only), Reta Trust-Blue Shield (telehealth)

Tricare: Effective Jan 1, 2025, Tricare has switched region allocation for several states. We are currently re-evaluating each of our provider's certification status for Tricare Select and will update profiles as we have confirmed status. Please check back for updates.

• 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.