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

This code signifies a fracture of the lower portion of the left ulna where the specific type of fracture is not documented. It indicates that the patient is in a later phase of treatment, and the fracture has failed to heal properly, despite the skin remaining intact over the injury site.

Use this code for follow-up encounters when a patient with a previously diagnosed, unspecified closed fracture of the distal left ulna presents with evidence of nonunion. This typically occurs when the bone fragments have not united after an expected healing period, requiring further intervention or management.

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