Displ longitud fx left patella, subs for clos fx w malunion

This code describes a situation where a patient has a left kneecap fracture that runs lengthwise, and the broken bone fragments are not properly aligned. This specific encounter is for follow-up care of this previously treated fracture, which has now healed in an unsatisfactory position.

Apply this code when documenting a patient's visit for ongoing management or evaluation of a malunited displaced longitudinal fracture of the left patella. This is appropriate for subsequent encounters after initial treatment, where the fracture has healed but with an anatomical deformity.

• Ensure documentation clearly states "left" patella and "longitudinal" fracture type.
• Confirm the fracture is "displaced" and has resulted in "malunion."
• Verify this is a "subsequent encounter" for the fracture, not the initial treatment.