bypass surgery bypass surgery bypass surgery refers to a class of surgery involving rerouting a tubular body part. bypass surgeryicd-10-pcs0?1 types include: vascular bypass surgery such as coronary artery bypass surgery, a heart operation cardiopulmonary bypass, a technique used in coronary artery bypass surgery weight loss or bariatric surgery: vertical banded gastroplasty surgery or "stomach stapling", the upper part of the stomach is permanently stapled to create a smaller pouch adjustable gastric band or "lap band", a band creates a pocket in the stomach that can be adjusted with a port placed just under the skin roux-en-y gastric bypass surgery, the small intestine is connected to the upper part of the stomach partial ileal bypass surgery, shortening the final portion of the small intestine popliteal bypass surgery, to treat diseased leg arteries above or below the knee jejunojejunostomy, surgery that connects two portions of small intestine and is no longer used ileojejunal bypass, surgery that connects the middle and final portions of the small intestine that was experimental and is no longer used.