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

This code signifies an unspecific break of the left kneecap that has not healed properly, and the patient is presenting for follow-up care. The initial injury was an open fracture, meaning the skin was broken, classified as either Type I or Type II. This indicates a persistent lack of bone union after the initial treatment for the open patellar fracture.

Apply this code when documenting subsequent encounters for a patient with a previously diagnosed unspecified open fracture (Type I or II) of the left patella that has progressed to nonunion. This would be used for follow-up appointments, evaluations for further treatment, or management of complications related to the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the left patella.
• Verify the original injury was an open fracture, Type I or II, even if the "open" aspect is no longer present.
• This code is for subsequent encounters; an initial encounter for the nonunion would use a different code.