Stress fracture, right toe(s), subs for fx w malunion

This code signifies a stress fracture in one or more toes of the right foot that is currently undergoing treatment for malunion. Malunion indicates that the fracture has healed, but in an unsatisfactory or deformed position, requiring further medical attention. The "subsequent encounter" aspect specifies that this is not the initial treatment for the fracture.

Apply this code when a patient presents for follow-up care, evaluation, or treatment related to a previously diagnosed stress fracture of the right toe(s) that has healed improperly. Documentation should clearly state "malunion" and specify the right toe(s) as the affected site, along with an indication of ongoing care for the malunion.

• Ensure documentation explicitly states "malunion" and the specific laterality (right toe(s)).
• Distinguish from nonunion (M84.377N) where the fracture has not healed at all.
• Always sequence this code after any underlying cause of the stress fracture, if applicable and still active.