CPT® Code 26100

The CPT® Code 26100 refers to an arthrotomy with biopsy specifically performed on the carpometacarpal (CMC) joint, which is one of the five joints located in each hand. The CMC joints are critical articulations that connect the distal row of carpal bones in the wrist to the proximal ends of the metacarpal bones that form the palm. This procedure involves making an incision over the affected CMC joint, allowing for access to the joint capsule. During the arthrotomy, the surgeon carefully dissects the surrounding soft tissues while protecting nearby nerves and blood vessels. Once the joint capsule is exposed, it is incised to allow for visual inspection of the joint interior. Tissue samples are then collected from the joint capsule and/or the synovial membrane for laboratory evaluation, which is essential for diagnosing various conditions affecting the joint. It is important to note that if the procedure is performed on the metacarpophalangeal (MCP) joint, CPT® Code 26105 should be used, and for the interphalangeal (IP) joint, CPT® Code 26110 is applicable. Each of these procedures is reported separately for each joint treated, ensuring accurate coding and billing for the services rendered.