Oth fx second MC bone, left hand, subs for fx w nonunion

This code signifies a fracture of the second metacarpal bone in the left hand that is not healing properly (nonunion). It is used when the patient is presenting for follow-up care or treatment related to this specific complication of the fracture. The "other" designation implies it's not a simple transverse, oblique, spiral, or comminuted fracture.

Apply this code for patients presenting for ongoing management of a left second metacarpal fracture that has failed to unite. This includes visits for cast changes, physical therapy, surgical planning for nonunion repair, or evaluation of persistent pain and instability due to the nonunion. It specifically indicates a subsequent encounter for the nonunion, not the initial injury.

• Ensure documentation clearly specifies "nonunion" and "left second metacarpal."
• Verify this is a subsequent encounter, not the initial treatment for the fracture.
• Pair with external cause codes (e.g., V-codes) if the cause of the original injury is relevant and documented.