Displ oblique fx shaft of unsp ulna, 7thN

This code describes a situation where a patient has a non-healing, displaced oblique fracture of the shaft of the ulna, which was originally an open fracture of severe type (IIIA, IIIB, or IIIC). The "subsequent encounter" indicates that the patient is receiving follow-up care for this previously diagnosed and treated injury, specifically addressing the complication of nonunion.

This code is appropriate for documenting follow-up visits where a patient with a history of a severe open ulnar shaft fracture is being managed for a nonunion. This includes scenarios where surgical intervention for the nonunion is being planned or performed, or when conservative management for the nonunion is ongoing.

• Ensure documentation clearly specifies "nonunion" as the reason for the subsequent encounter.
• Verify the original fracture was an open fracture of type IIIA, IIIB, or IIIC.
• Do not use for initial fracture treatment or for malunion, which is a separate condition.