Mark Klucka, DO, is a board-certified gastroenterologist who sees patients 18 years and older. He specializes in diagnosing and treating digestive diseases, including Barrett’s esophagus, celiac disease, hepatitis, liver cirrhosis, ulcers, irritable bowel syndrome and inflammatory bowel diseases. He offers comprehensive diagnostic and therapeutic care, including screening for colorectal cancer, upper endoscopy, ERCP procedures, endoscopic ultrasound and pill camera endoscopies. This practice is a part of BJC Medical Group of Illinois.