Unsp fx fourth thor vertebra, subs for fx w nonunion

This code signifies a fracture of the fourth thoracic vertebra where the specific type of fracture (e.g., compression, comminuted) is not documented. The "K" seventh character indicates that the patient is receiving active treatment for a nonunion, meaning the fracture has failed to heal properly after the initial treatment phase.

This code is appropriate for subsequent encounters when a patient with an unclassified fracture of the T4 vertebra is being managed for a documented nonunion. This could include follow-up appointments, imaging studies, or procedures related to addressing the delayed or failed bone healing.

• Ensure documentation explicitly states "nonunion" and that the encounter is for ongoing treatment of this complication.
• Verify the fracture location is specifically the fourth thoracic vertebra (T4).
• Do not use for initial fracture treatment or for malunion, which is a different complication.