Gastroenterology 3331 West DeYoung Street Suite 305 Marion, IL 62959 Colorectal Gastroenterology General Surgery Hematology and Oncology Hours: Monday - Friday: 8:00 am - 4:30 pm Phone: 618-998-7155 Call 618-998-7155 to make an appointment. ASSOCIATED CARE Gastroenterology ASSOCIATED PROVIDERS Yazan Abu Qwaider, MD