Disp fx of trapezium, left wrist, subs for fx w malunion

This code signifies a left wrist injury involving a displaced fracture of the trapezium bone, which is one of the carpal bones. The patient is in a subsequent phase of care, and the fracture is healing improperly, resulting in malunion. This indicates a complication in the bone's healing process where it has united in a position that is not anatomically correct.

Use this code for follow-up encounters where a patient is being treated for a previously diagnosed displaced trapezium fracture of the left wrist that has healed in a misaligned position. This would apply when the malunion is being actively managed, for example, through physical therapy, bracing, or surgical planning for corrective osteotomy. It is appropriate for ongoing care related to the malunion after the initial acute treatment phase.

• Ensure documentation clearly specifies "displaced" and "malunion" for the trapezium fracture.
• Verify the laterality is "left wrist" as specified by the code.
• Confirm this is a "subsequent encounter" and not an initial or sequela encounter.