Torus fx lower end of unsp fibula, subs for fx w nonunion

This code signifies a buckle fracture, or torus fracture, affecting the distal portion of the fibula where the bone cortex buckles but does not fully break. The "subsequent encounter" indicates the patient is receiving follow-up care for this fracture, and "nonunion" specifies that the bone fragments have failed to heal together after the expected healing period.

Apply this code when documenting ongoing treatment for a torus fracture of the lower fibula that has not united. This would be used after the initial treatment phase, for example, during follow-up appointments for cast changes, physical therapy, or surgical planning for the nonunion. It specifically applies when the exact side (left or right) of the fibula is not documented.

• Ensure documentation clearly states "torus fracture" and "nonunion" for accurate code assignment.
• Verify the encounter is for subsequent care, not the initial treatment of the fracture.
• Only use this code when the laterality of the fibula is unspecified in the medical record.