Hello and Welcome to Healing Well,
I am glad to read your Father is healthy otherwise but I am not sure what his Dr. will say about bypass surgery. It really depends on how healthy a person is and the risks of the surgery. Diagnostic tests have helped your Father's heart doctor identify the location, type and extent of your Father's coronary artery disease. The results of these tests, the structure of your Father's heart, his age, the severity of his symptoms, the presence of other medical conditions, and his lifestyle will help his Dr. determine what type of treatment is best.
I wish him the very best and hoped this has helped a bit in answering your question.