Bent bone of unsp ulna, subs for clos fx w malunion

This code describes a bent or deformed ulna bone resulting from a previous fracture that healed improperly (malunion). The current encounter is for follow-up care or treatment related to this established malunion, and the skin over the fracture site is intact.

Apply this code when a patient presents for ongoing management, evaluation, or treatment of a malunited closed fracture of an unspecified ulna, where the bone has healed in a bent or angulated position. This is appropriate for subsequent visits after the initial treatment of the fracture.

• Ensure documentation clearly states "malunion" and specifies the ulna.
• Verify the encounter is for a "subsequent" visit, not the initial treatment of the fracture or the malunion.
• Confirm the fracture was "closed" at the time of the original injury.