CPT® Code 29904

The procedure described by CPT® Code 29904 refers to an arthroscopic surgical intervention performed on the subtalar joint, which is located in the lower ankle between the talus and the calcaneus bones. This joint is classified as a compound joint and is divided into two distinct compartments, separated by a space that contains the talocalcaneal and cervical ligaments. The primary goal of this procedure is to remove loose bodies or foreign bodies that may be causing pain or dysfunction within the joint. Prior to the surgical intervention, the joint is distracted, which means that the joint surfaces are separated to enhance visibility and access to the entire joint structure. During the procedure, two or three access portals are created to allow the surgeon to thoroughly examine the joint. If a loose or foreign body is identified, a specialized instrument known as a grasper is utilized to retrieve it. Following the removal of the loose or foreign body, the joint is irrigated to clear any debris and is inspected to ensure that all foreign materials have been adequately addressed. In cases where a large loose or foreign body is present and cannot be extracted through the established portals, an additional small accessory incision may be necessary to facilitate its removal.