CPT® Code 43645

Laparoscopy, surgical, gastric restrictive procedure; with gastric bypass and small intestine reconstruction to limit absorption

The CPT® Code 43645 refers to a laparoscopic surgical procedure designed to address morbid obesity through a gastric restrictive approach combined with gastric bypass and small intestine reconstruction aimed at limiting nutrient absorption. This procedure is typically indicated for patients who have not achieved significant weight loss through non-surgical means and are at risk for obesity-related health complications. The process begins with the creation of small incisions in the upper abdomen, allowing for the insertion of a trocar and the establishment of pneumoperitoneum, which is the introduction of gas into the abdominal cavity to create a working space for the surgeon. A laparoscope, a specialized camera, is then introduced to provide visualization of the internal structures. Additional incisions are made to facilitate the insertion of surgical instruments necessary for the procedure. During the operation, the liver is retracted to expose the upper stomach, and the gastroesophageal junction is identified. The gastrohepatic ligament is incised, creating a tunnel behind the stomach. An endoscopic linear stapler is utilized to transect the stomach, forming a small gastric pouch that restricts food intake. The procedure continues with the identification of the ligament of Treitz, where the jejunum is transected. A Roux-en-Y gastroenterostomy is performed, which involves creating a bypass that allows food to flow from the gastric pouch into the jejunum, effectively bypassing a significant portion of the small intestine. In the context of CPT® Code 43645, the procedure includes the reconstruction of the small intestine to further limit absorption, which is a critical aspect of promoting weight loss through malabsorption. This may involve the creation of a Roux limb that exceeds 150 cm, with options for a short biliopancreatic limb or a longer limb that is anastomosed distal to the ileocecal valve. Overall, this complex surgical intervention combines both restrictive and malabsorptive techniques to facilitate significant weight loss and improve the health outcomes of patients suffering from severe obesity.