Nondisp fx of trapezium, left wrist, subs for fx w nonunion

This code signifies a fracture of the trapezium bone in the left wrist that has not shifted from its normal anatomical position. The "subsequent encounter" indicates that the patient is receiving ongoing care for this fracture, and "nonunion" specifies that the bone fragments have failed to heal together after a typical healing period.

This code is appropriate for follow-up visits where a patient is being treated for a previously diagnosed, non-displaced left trapezium fracture that has not shown signs of healing. This includes scenarios such as cast changes, physical therapy evaluations, or surgical planning for nonunion. It would not be used for the initial diagnosis of the fracture.

• Ensure documentation clearly states "left wrist" and "nonunion" for this specific bone.
• Verify the fracture is explicitly documented as "nondisplaced" to differentiate from other displacement types.
• This code requires an additional code to specify the type of nonunion (e.g., M84.4x-).