Stress fracture, left ulna, subs for fx w malunion

This code signifies a stress fracture of the left ulna that has previously been treated but has healed in an unsatisfactory position, resulting in a malunion. The patient is currently receiving care for this specific complication.

Apply this code when a patient presents for follow-up care, evaluation, or treatment of a left ulnar stress fracture that has healed with a deformity (malunion). Documentation should clearly indicate a prior stress fracture of the left ulna and current management for the resulting malunion.

• Ensure documentation specifies "stress fracture" and not a traumatic fracture, as different codes apply.
• Verify the laterality (left ulna) and the encounter type (subsequent encounter for fracture with malunion).
• Do not confuse with nonunion (M84.4-) or routine follow-up for a healing fracture without complications.