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

This code signifies a fracture of the upper portion of the left ulna, where the specific type of fracture (e.g., olecranon, coronoid) was not documented. The patient is in a subsequent phase of care for this injury, and the fracture has failed to heal properly, indicating a nonunion.

Apply this code when a patient presents for follow-up care of an unhealed, previously diagnosed closed fracture of the proximal left ulna, and the exact fracture site within the upper end was not specified in the initial diagnosis. This is appropriate for encounters addressing the ongoing management or complications of the nonunion.

• Ensure documentation clearly states "nonunion" and specifies the left ulna.
• Verify that the encounter is for subsequent care, not the initial treatment of the fracture.
• Confirm that the fracture was initially closed; if open, a different code series would apply.