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

This code signifies an unspecified fracture of the right kneecap that has failed to heal properly, specifically when the patient is receiving care for a severe open fracture (Type IIIA, IIIB, or IIIC). "Unspecified" indicates that the exact type of patellar fracture (e.g., transverse, comminuted) is not documented.

Use this code for a patient presenting for follow-up care, such as cast changes, wound care, or surgical planning, for a previously diagnosed open patellar fracture of the right knee that has developed nonunion. This code is appropriate when the medical record clearly indicates nonunion and the initial open fracture was classified as Type IIIA, IIIB, or IIIC.

• Requires documentation of "nonunion" and a "subsequent encounter" for an open fracture.
• Ensure the laterality (right) is clearly documented.
• Do not use for initial encounters or for malunion; specific codes exist for those scenarios.