Oth fx upper end r ulna, subs for opn fx type I/2 w nonunion

This code describes a nonunion of an open fracture (Type I or II) involving the proximal end of the right ulna. "Nonunion" indicates that the bone has failed to heal completely after a previous fracture, and "subsequent encounter" signifies ongoing treatment for this complication.

Apply this code when documenting follow-up care for a patient with a previously diagnosed open fracture of the right olecranon or coronoid process that has not healed and is now considered a nonunion. This is appropriate for encounters focused on managing the nonunion, such as evaluating for surgical intervention or monitoring conservative treatment.

• Ensure documentation clearly specifies "nonunion" and the "subsequent encounter" for the fracture.
• Verify the fracture was initially classified as an open Type I or II fracture.
• Confirm the laterality (right ulna) and the specific location (upper end/proximal) of the fracture.