Unsp fx left patella, subs for opn fx type 3A/B/C w malunion

This code describes a situation where a patient has a malunion of an unspecified fracture of the left patella. This malunion is being addressed during a subsequent encounter, and the original fracture was an open fracture classified as Type IIIA, IIIB, or IIIC.

This code is appropriate for follow-up visits where a patient is being treated for a left patellar fracture that has healed in a misaligned or deformed position. It specifically applies when the initial injury was a severe open fracture and the current encounter is for managing the resulting malunion. This could include assessments for surgical correction, physical therapy, or monitoring of the malunion's impact on knee function.

• Ensure documentation clearly specifies "malunion" and the "subsequent encounter" status.
• Verify the original open fracture type (IIIA, IIIB, or IIIC) is documented or can be inferred from the patient's history.
• Do not use this code for initial treatment of the fracture or for nonunion.