Stress fracture, left humerus, subs for fx w nonunion

This code signifies a stress fracture located in the left humerus that has failed to heal properly, indicating a nonunion. It specifically applies to a patient who is receiving active treatment for this nonunion after the initial treatment of the stress fracture.

Apply this code when a patient presents for ongoing management of a left humeral stress fracture that has been diagnosed as a nonunion. Documentation should clearly state "nonunion" of the stress fracture and specify the left humerus, along with an indication of subsequent care (e.g., follow-up, re-evaluation, further treatment).

• Ensure documentation explicitly states "nonunion" and not just delayed healing.
• Verify laterality (left humerus) is clearly documented.
• This "K" seventh character indicates subsequent encounter for a nonunion, not initial or sequela.