CPT® Code 26861

Add-On Code

Arthrodesis, interphalangeal joint, with or without internal fixation; each additional interphalangeal joint (List separately in addition to code for primary procedure)

Arthrodesis of an interphalangeal (IP) joint is a surgical procedure aimed at fusing the bones of the joint to alleviate pain and restore stability, particularly in cases of arthritis or joint instability. The procedure involves making an incision over the affected IP joint, allowing the surgeon to access the joint capsule. Once the joint is exposed, the surgeon inspects the joint surfaces and excises the articular cartilage from the phalangeal bones. This step is crucial as it prepares the bone surfaces for fusion by smoothing and reshaping them using a bur, ensuring they can be held in the desired position. In some cases, internal fixation devices such as pins or wires may be utilized to maintain the joint in the correct alignment until the fusion process is complete. After the joint surfaces are properly aligned and secured, the soft tissues surrounding the joint are meticulously repaired in layers. Finally, a cast or splint is applied to immobilize the joint during the healing process. It is important to note that CPT® Code 26861 is specifically used for each additional IP joint that undergoes fusion, following the primary procedure coded with CPT® Code 26860. This distinction is essential for accurate medical coding and billing, as it reflects the complexity and extent of the surgical intervention performed.