Subluxation of carpometacarpal joint of left thumb, init

This code signifies a partial dislocation of the joint at the base of the left thumb, specifically where the carpal bones meet the metacarpal bone. This injury involves stretching or tearing of the joint capsule and ligaments, leading to instability and pain, but the joint surfaces remain in partial contact.

Apply this code when documenting an initial visit for a patient presenting with a subluxation of the left thumb's carpometacarpal joint. This includes acute injuries resulting from trauma, falls, or repetitive stress where the patient is receiving active treatment for the first time.

• Ensure documentation clearly specifies the left thumb and the carpometacarpal joint.
• Verify that this is indeed the patient's initial encounter for this specific injury.
• Distinguish from a complete dislocation (luxation) where joint surfaces are fully separated.