Oth fx upper end of left ulna, subs for clos fx w nonunion

This code describes a fracture in the upper portion of the left ulna that is not healing properly (nonunion) and is being managed in a subsequent encounter. The skin over the fracture site remains intact (closed fracture).

Apply this code when documenting follow-up care for a patient with a previously diagnosed closed fracture of the proximal left ulna that has failed to unite. This includes scenarios where the patient is undergoing ongoing treatment, such as cast changes, physical therapy, or awaiting further surgical intervention for the nonunion.

• Ensure documentation clearly specifies "left ulna" and "upper end" (e.g., olecranon, coronoid process).
• Verify the encounter is for follow-up care of the nonunion, not the initial treatment.
• Always sequence this code after the appropriate external cause code, if applicable, for the original injury.