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

This code signifies an unconfirmed fracture of the kneecap, where the specific type of fracture is not documented, and the bone has failed to heal properly after an initial injury. This particular encounter is for an open fracture, meaning the skin was broken, and it is classified as either Type I or Type II according to the Gustilo-Anderson classification.

Use this code for follow-up care of a patient with a previously diagnosed, but unspecified, patellar fracture that was open (Type I or II) and is now experiencing nonunion. This would apply when the patient presents for ongoing treatment, such as surgical intervention or cast changes, due to the fracture not healing.

• Ensure documentation clearly states "nonunion" and specifies an "open fracture type I or II" for the patella.
• This code is for subsequent encounters, not the initial treatment of the fracture.
• Verify that the specific type of patellar fracture (e.g., transverse, comminuted) is not documented, necessitating the "unspecified" designation.