Displ commnt fx shaft of ulna, unsp arm, 7thM

This code signifies a complex injury involving a comminuted (shattered into multiple fragments) fracture of the ulna's shaft, which is also displaced (bones are out of alignment). The fracture was initially an open fracture (skin broken) of type I or II, and the current encounter is for a nonunion, meaning the bone has failed to heal properly after a previous treatment. The specific arm (left or right) is not documented.

This code is appropriate for subsequent encounters when a patient presents with a documented nonunion of a previously treated open comminuted ulnar shaft fracture (Type I or II). This would typically involve follow-up appointments, evaluations for surgical intervention to address the nonunion, or management of complications related to the nonunion.

• Ensure documentation clearly specifies "nonunion" and the initial fracture was an "open fracture type I or II."
• Verify the fracture location is specifically the "shaft of ulna" and not another part of the bone.
• Confirm the encounter is "subsequent" and not the initial treatment for the fracture.