Stress fracture, unsp femur, subs for fx w nonunion

This code signifies a stress fracture of an unspecified femur that has failed to heal properly and is currently being treated. It indicates a chronic complication where the bone fragments have not united after a previous stress fracture event. The "subsequent encounter" aspect means the patient is receiving follow-up care for this ongoing nonunion.

Apply this code when a patient presents for ongoing management of a stress fracture in an unspecified femur that has not healed, and the current visit is for treatment of this nonunion. Documentation should clearly state "stress fracture," "femur," "nonunion," and indicate that this is not the initial treatment encounter for the fracture itself.

• Ensure documentation specifies "stress fracture" and "nonunion" for the femur.
• Verify laterality (left, right) if specified; if not, "unspecified" is appropriate.
• Distinguish from initial encounters for the fracture or encounters for routine healing.