Unsp fx lower end of left tibia, subs for clos fx w nonunion

This code indicates an unspecific fracture of the distal portion of the left shin bone that has not healed properly. The patient is receiving ongoing care for this nonunion, and the skin over the fracture site remains intact.

This code is appropriate for follow-up visits where a patient is being treated for a previously diagnosed, unspecific closed fracture of the lower left tibia that has failed to unite. This includes scenarios such as cast changes, physical therapy, or medication management for the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the "left tibia" and "lower end."
• Verify the encounter is for subsequent care, not the initial treatment of the fracture.
• Confirm the fracture is "closed" (no open wound communicating with the fracture site).