Torus fx lower end of left fibula, subs for fx w malunion

This code signifies a torus (buckle) fracture affecting the distal end of the left fibula that has not healed correctly, resulting in malunion. The patient is currently undergoing active treatment for this malunion or is being seen for follow-up care related to the malunion.

Apply this code when a patient presents with a previously diagnosed torus fracture of the lower left fibula that has healed in an anatomically incorrect position. This is appropriate for encounters where the malunion is being managed, such as for pain, functional limitation, or surgical correction.

• Ensure documentation clearly specifies "torus" or "buckle" fracture and "malunion" for the left fibula.
• Verify the encounter is for subsequent care related to the fracture and its malunion, not initial treatment.
• Always sequence this code with an external cause code if the cause of the fracture is known and relevant to the encounter.