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

This code signifies a previously sustained, unspecific fracture of the kneecap that is now presenting with a malunion. The original fracture was an open fracture, classified as type IIIA, IIIB, or IIIC, indicating significant soft tissue damage and contamination. The current encounter addresses the improper healing of this prior injury.

This code is appropriate for subsequent encounters where a patient is being treated for a patellar malunion resulting from a previously documented open fracture (type IIIA, IIIB, or IIIC). This would include follow-up appointments, evaluations for corrective surgery, or management of complications arising from the malunion.

• Ensure documentation clearly specifies "malunion" as the reason for the current encounter, not just a healing fracture.
• Verify the original fracture was an open fracture type IIIA, IIIB, or IIIC; if not, a different malunion code may be more appropriate.
• This code is for the unspecified patella; if laterality is known, a more specific code should be used.