Path fx in oth disease, unsp femur, subs for fx w nonunion

This code signifies a pathological fracture of an unspecified femur that has failed to heal properly (nonunion) and the patient is receiving active treatment for this nonunion. A pathological fracture occurs due to an underlying disease weakening the bone, rather than from trauma. This code is used for follow-up care after the initial treatment of the fracture.

Apply this code when a patient presents for ongoing management of a femoral nonunion resulting from a pathological fracture. Documentation should clearly indicate the pathological nature of the fracture, the anatomical site (femur, unspecified), and that the encounter is for treatment of the nonunion, not the initial fracture care. This code is appropriate for subsequent visits involving surgical intervention, cast changes, or medication adjustments for the nonunion.

• Always sequence the underlying disease causing the pathological fracture first, if known and still active.
• Ensure documentation specifies "nonunion" and not "malunion" or "delayed healing," as these have different codes.
• Verify the encounter is "subsequent" for the fracture with nonunion, distinguishing it from initial treatment or sequela.