Unsp fx left patella, subs for opn fx type I/2 w malunion

This code describes a left kneecap fracture that was initially open (meaning the bone broke through the skin or was exposed to the outside environment) and is now being treated for a complication where the bone has healed in an improper alignment. The specific type of open fracture (Type I or II) indicates a lower severity of soft tissue damage and contamination at the time of the initial injury. The "unspecified" nature of the fracture means the exact location or pattern of the patellar break is not documented.

Use this code for follow-up encounters where a patient with a previously diagnosed open Type I or II fracture of the left patella is being managed for malunion. This includes visits for assessment, ongoing treatment, or surgical intervention to correct the improperly healed bone.

• Ensure documentation clearly states "malunion" as the reason for the subsequent encounter.
• Verify the initial injury was an open fracture, specifically Type I or II, and involved the left patella.
• Do not use for nonunion or routine follow-up without a documented malunion.