Disp fx of nk of 1st MC bone, l hand, subs for fx w malunion

This code describes a fracture of the neck of the first metacarpal bone (thumb) in the left hand, where the bone fragments have healed in an abnormal alignment. This specific code indicates that the patient is presenting for follow-up care related to this malunion, rather than the initial injury or routine healing.

This code is appropriate for encounters where a patient is being evaluated or treated for complications arising from a malunited fracture of the left thumb's first metacarpal neck. This includes scenarios such as pain, deformity, or functional limitations directly attributable to the malunion, during a subsequent visit after the initial treatment.

• Ensure documentation clearly specifies "malunion" and not just delayed healing or nonunion.
• Verify the laterality (left hand) and the specific bone (first metacarpal neck).
• Confirm this is a "subsequent encounter" for the fracture, not the initial treatment or routine follow-up for a healing fracture.