Unsp fx shaft of unsp tibia, subs for clos fx w nonunion

This code signifies a fracture of the main part (shaft) of the lower leg bone (tibia) where the exact location or type of fracture is not specified. The fracture has failed to heal properly (nonunion) and the patient is presenting for follow-up care, with the skin over the fracture remaining intact (closed fracture).

Apply this code when documentation indicates a nonunion of a closed, unspecified tibial shaft fracture, and the patient is receiving subsequent treatment for this condition. This is appropriate for ongoing management, such as cast changes, physical therapy, or preparation for further surgical intervention related to the nonunion.

• Ensure documentation clearly states "nonunion" and "subsequent encounter" for a closed fracture.
• Avoid using this code if the specific location (e.g., proximal, distal) or type of tibial shaft fracture is known; use a more specific code instead.
• Always sequence this code after any acute fracture codes if the nonunion is a complication of a recently treated fracture.