Torus fx upper end of unsp ulna, subs for fx w nonunion

This code describes a specific type of incomplete fracture (torus or buckle fracture) affecting the upper portion of the ulna bone, where the bone has compressed but not completely broken. It indicates that the patient is in a later phase of treatment for this fracture, and the fracture is not healing as expected (nonunion).

Apply this code when a patient presents for follow-up care of a previously diagnosed torus fracture of the proximal ulna, and imaging or clinical assessment confirms that the fracture has failed to unite. This typically involves ongoing management, such as further immobilization, surgical intervention for nonunion, or evaluation of delayed healing.

• Ensure documentation clearly specifies "nonunion" for this specific fracture site and type.
• Verify that the encounter is for subsequent care, not the initial treatment of the fracture.
• Always sequence this code after any relevant external cause codes or other complications.