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

This code signifies a stress fracture affecting an unspecified toe, where the patient is presenting for follow-up care of a fracture that has healed improperly (malunion). A stress fracture is a tiny crack in a bone, often caused by repetitive stress or overuse, rather than a single traumatic event. Malunion indicates that the bone has healed in an abnormal or deformed position, which can lead to pain, functional impairment, and further complications.

This code is appropriate for encounters where a patient is receiving ongoing treatment or evaluation for a previously diagnosed stress fracture of an unspecified toe that has resulted in malunion. Documentation should clearly indicate a stress fracture, the specific toe(s) if known (though this code is for unspecified), evidence of malunion (e.g., imaging reports, physician notes describing deformity), and that this is not the initial treatment for the fracture.

• Ensure documentation explicitly states "stress fracture" and "malunion" for the unspecified toe(s).
• Verify that the encounter is for subsequent care, not the initial treatment of the fracture or malunion.
• If the specific toe is identified, a more precise code from the M84.37- series should be used (e.g., M84.371P for great toe).