Stress fracture, unsp foot, subs for fx w malunion

This code signifies a stress fracture located in an unspecified foot, which is currently undergoing treatment for a malunion. A malunion indicates that the fracture has healed, but in an unsatisfactory or misaligned position. This code is used for encounters following the initial treatment phase, where the focus is on managing the complications of the malunion.

Apply this code when a patient presents for follow-up care, rehabilitation, or further intervention related to a stress fracture of the foot that has healed incorrectly. Documentation should clearly state "stress fracture," "foot," "malunion," and indicate that this is not the initial treatment encounter for the fracture itself.

• Ensure documentation specifies "stress fracture" and not another type of fracture (e.g., traumatic).
• Verify the encounter is for a subsequent phase of care for the malunion, not the initial fracture treatment or routine follow-up for a well-healing fracture.
• Distinguish from nonunion (M84.376N), where the fracture has failed to heal completely.