Oth fx low end unsp ulna, 7thN

This code describes a complex fracture at the lower end of the ulna, where the bone has broken through the skin (open fracture types IIIA, IIIB, or IIIC) and has failed to heal properly after an initial treatment. It indicates that the patient is receiving ongoing care for this specific complication.

Use this code for follow-up encounters when a patient presents with a previously diagnosed open fracture of the distal ulna that has developed nonunion. This applies when the initial injury was classified as a severe open fracture (Gustilo-Anderson types IIIA, IIIB, or IIIC) and the bone fragments have not united.

• Ensure documentation clearly specifies an open fracture of the distal ulna with nonunion.
• Verify the encounter is for subsequent care, not the initial treatment of the fracture.
• Confirm the original open fracture type was IIIA, IIIB, or IIIC, as this impacts code selection.