Disp fx of shaft of unsp MC bone, subs for fx w nonunion

This code signifies a fracture of the shaft of an unspecified metacarpal bone that is displaced, meaning the bone fragments are not properly aligned. The "subsequent encounter" indicates that the patient is receiving follow-up care for this fracture, and the "nonunion" specifies that the bone has failed to heal completely after a typical healing period.

This code is appropriate for use when a patient presents for ongoing treatment of a displaced metacarpal shaft fracture that has not united. This includes situations where the patient is undergoing further evaluation, conservative management, or surgical intervention for the nonunion. It would be used after the initial treatment of the fracture.

• Ensure documentation clearly states "displaced" and "nonunion" for the metacarpal shaft fracture.
• Verify that this is a subsequent encounter, not the initial treatment of the fracture.
• If the specific metacarpal bone is known, a more specific code (e.g., S62.321K for the second metacarpal) should be used.