Nondisp fx of med malleolus of unsp tibia, 7thN

This code describes a situation where a patient has a non-displaced fracture of the inner ankle bone (medial malleolus) of an unknown tibia, and the fracture was initially an open fracture (meaning the bone broke through the skin) classified as type IIIA, IIIB, or IIIC. Crucially, the bone fragments have failed to heal together properly (nonunion), and this code is used during a follow-up visit for ongoing management of this complication.

This code is appropriate for subsequent encounters when a patient is being treated for a nonunion of a previously diagnosed open medial malleolus fracture (types IIIA, IIIB, or IIIC) that was initially non-displaced. It should be used when the physician is actively managing the nonunion, such as during follow-up appointments, cast changes, or preparations for revision surgery.

• Ensure documentation clearly specifies "nonunion" and the original open fracture type (IIIA, IIIB, or IIIC).
• Verify the fracture was initially "nondisplaced" to accurately apply this code.
• This code is for subsequent encounters; an initial encounter would use a different code.