Disp fx of med malleolus of unsp tibia, 7thM

This code describes a fracture of the medial malleolus (the inner ankle bone) that is no longer in its anatomical position and has broken through the skin, classified as an open fracture type I or II. Critically, the bone fragments have failed to heal together after an initial treatment, indicating a nonunion.

This code is used for follow-up encounters when a patient with a previously treated displaced open medial malleolar fracture (Type I or II) is experiencing a nonunion. It signifies ongoing management of the unhealed fracture, such as for further surgical intervention, casting, or other nonunion treatment.

• Requires a seventh character "M" to indicate subsequent encounter for nonunion.
• Ensure documentation specifies "displaced" and "open fracture type I or II" for the medial malleolus.
• Always sequence this code after any associated external cause codes, if applicable.