Oth fx unsp patella, subs for opn fx type 3A/B/C w malunion

This code signifies a previously sustained open fracture of the patella (kneecap) that was severe (Type IIIA, IIIB, or IIIC) and has now healed incorrectly, resulting in malunion. The patient is currently receiving follow-up care or treatment for this complication.

Apply this code when documenting ongoing management, rehabilitation, or surgical intervention for a patellar fracture that has healed in a misaligned position following an initial open injury. This is appropriate for patients presenting with pain, functional limitations, or other issues directly attributable to the malunion of a prior severe open patella fracture.

• Ensure documentation clearly specifies "malunion" as the complication of the prior open patella fracture.
• Verify the original fracture was an open Type IIIA, IIIB, or IIIC to justify this specific code.
• Confirm this is a "subsequent encounter" for the ongoing management of the malunion, not the initial treatment of the fracture.