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

This code signifies a non-healing fracture in an unspecified part of the lower leg, excluding the ankle, that was initially an open fracture of Gustilo-Anderson type IIIA, IIIB, or IIIC. The "subsequent encounter" indicates that the patient is receiving follow-up care for this previously diagnosed injury, and "nonunion" confirms that the bone has failed to heal after a reasonable period.

Use this code for patients presenting for ongoing management of a lower leg fracture (tibia or fibula, excluding ankle) that was initially severe and open, and has now progressed to a nonunion. This applies when the original injury involved significant soft tissue damage, such as extensive lacerations or periosteal stripping, and the bone fragments have not united.

• Ensure documentation clearly specifies "nonunion" and the initial open fracture type (IIIA, IIIB, or IIIC).
• Verify that the encounter is for follow-up care, not the initial treatment of the fracture.
• Confirm the fracture location is within the lower leg but not specifically the ankle.