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

This code signifies a non-healing fracture of the kneecap, where the specific location of the break within the patella is not documented. It indicates that the initial injury was an open fracture, classified as severe (Type IIIA, IIIB, or IIIC), and the patient is now presenting for follow-up care due to the bone failing to unite.

This code is appropriate for subsequent encounters when a patient with a previously diagnosed severe open patellar fracture (Gustilo-Anderson Type IIIA, IIIB, or IIIC) is being treated for nonunion. It should be used when the medical record does not specify the exact part of the patella that is fractured.

• Ensure documentation clearly states "nonunion" and the encounter is for follow-up care, not initial treatment.
• Verify the original open fracture was classified as Type IIIA, IIIB, or IIIC.
• Avoid using this code if a more specific anatomical site of the patellar fracture is documented.