Oth fx unsp femur, subs for opn fx type 3A/B/C w nonunion

This code signifies a non-healing fracture of an unspecified part of the femur that was initially an open fracture with significant soft tissue damage (Type IIIA, IIIB, or IIIC). The "subsequent encounter" indicates that the patient is receiving ongoing treatment for this previously diagnosed injury, and the "nonunion" specifies that the bone fragments have failed to heal together.

Apply this code when documenting follow-up care for a patient whose initial open femoral fracture (classified as IIIA, IIIB, or IIIC) has not united. This includes scenarios where surgical intervention, such as bone grafting or revision fixation, is being performed or planned due to the lack of healing. It is appropriate for any encounter after the initial treatment of the open fracture, specifically addressing the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the initial fracture as an open Type IIIA, IIIB, or IIIC.
• Verify that the encounter is for ongoing treatment of the fracture, not the initial injury.
• Always code the specific type of nonunion (e.g., S72.8X9N for unspecified femur) when documented.