Dislocation of carpometacarpal joint of left thumb, init

This code describes a complete displacement of the bones forming the joint at the base of the left thumb, specifically where the carpal bones meet the metacarpal bone of the thumb. This injury disrupts the normal alignment and function of the thumb's articulation with the wrist.

Use this code for a patient presenting with a newly diagnosed or initially treated dislocation of the carpometacarpal joint of their left thumb. This would typically be seen following trauma, such as a fall or direct impact to the hand.

• Ensure documentation specifies "left" thumb and "carpometacarpal joint" to support this specific code.
• The "A" seventh character indicates an initial encounter for active treatment of the dislocation.
• Do not use for subluxation; a complete dislocation must be documented.