
Radwan H. Diab, MD
Medical Oncology / Hematology
Dr. Radwan H. Diab is a medical oncologist and hematologist who joined Cancer Care Specialists of Illinois in July 2026. He primarily sees patients at the Cancer Care Center of Decatur and also provides coverage at CCSI clinics throughout central Illinois.
Dr. Diab earned his Doctor of Medicine degree from the American University of Beirut in Lebanon in 2018. He completed his residency in Internal Medicine at the University of Kansas School of Medicine in Wichita, Kansas, followed by a fellowship in Hematology and Medical Oncology at Tulane University School of Medicine in New Orleans, Louisiana.
He is board certified in Internal Medicine and Hematology and board eligible in Medical Oncology. He is a member of the American Society of Hematology, the American Society of Clinical Oncology, and the American College of Physicians.
Dr. Diab cares for patients with solid tumors, hematologic malignancies and benign blood disorders. He believes that excellent care begins with listening and clear communication. He takes time to understand each patient’s concerns, explain treatment options clearly and develop an individualized plan that reflects the patient’s goals and needs. Before entering clinical practice, he served as a research scholar at MD Anderson Cancer Center and contributed to oncology research, publications and scientific presentations.
Outside of medicine, Dr. Diab enjoys spending time with his family and their golden retriever, exercising, reading, traveling and exploring new places.
Oncology/Hematology Fellowship
Tulane University School of Medicine, New Orleans, LA, 2026
Internal Medicine Residency
University of Kansas School of Medicine, Wichita, KS, 2023
Education
M.D., American University of Beirut, Beirut, Lebanon, 2018
B.S., Biology, American University of Beirut, Beirut, Lebanon, 2014
Certifications
Medical Oncology – Board Eligible
Hematology – American Board of Internal Medicine
Internal Medicine – American Board of Internal Medicine
Memberships
American Society of Hematology
American Society of Clinical Oncology
American College of Physicians
Hometown
Beirut, Lebanon
Cancer Care Center of Decatur
Cancer Care Specialists of IL
210 W. McKinley Ave., Suite 1
Decatur, IL 62526
Phone: (217) 876-6600
Fax: (217) 876-6606
Hours: M – F, 8:00 am – 4:30 pm
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