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

This code signifies a fracture of the second metacarpal bone in the right hand that has not healed properly, and the patient is presenting for follow-up care or ongoing treatment related to this nonunion. It indicates a complication where the bone fragments have failed to unite after a previous fracture.

Use this code when documenting a patient visit for management of a previously diagnosed right second metacarpal fracture that has progressed to nonunion. This includes scenarios such as evaluation for surgical intervention to promote healing, cast changes, or physical therapy related to the unhealed fracture.

• Ensure documentation clearly states "nonunion" and specifies the right second metacarpal.
• Verify this is a subsequent encounter for the fracture, not the initial treatment.
• Pair with appropriate external cause codes (V, W, X, Y categories) if the cause of the original injury is still relevant and documented.