Unsp fx fifth MC bone, left hand, subs for fx w nonunion

This code signifies a fracture of the fifth metacarpal bone in the left hand where the specific type of fracture is not documented. The patient is in a subsequent phase of care, and the fracture has failed to heal properly, indicating a nonunion.

Use this code for follow-up encounters when a patient presents with a previously diagnosed, unspecified fracture of the left fifth metacarpal that has not united. This applies when the physician is managing the nonunion, such as discussing surgical options, monitoring healing, or providing ongoing conservative treatment.

• Requires an additional code to specify the nonunion (e.g., M89.8X7).
• Ensure documentation clearly states "left hand," "fifth metacarpal," and "nonunion" for accurate assignment.
• Do not use for initial encounters or for fractures that are healing normally.