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

This code signifies an unspecified fracture of the femur that has failed to heal properly (nonunion) and is being treated during a subsequent encounter. The original fracture was an open fracture of Gustilo-Anderson type IIIA, IIIB, or IIIC, indicating significant soft tissue damage and contamination.

Apply this code when a patient presents for follow-up care, such as cast changes, wound care, or surgical planning, for a previously diagnosed open femoral fracture that has developed nonunion. This code is appropriate when the specific location of the femoral fracture is not documented.

• Ensure documentation clearly specifies "nonunion" and a "subsequent encounter" for an open fracture.
• Verify the original fracture was classified as Gustilo-Anderson type IIIA, IIIB, or IIIC.
• If the specific site of the femoral fracture is known (e.g., shaft, neck), a more specific code should be used.