Displ seg fx shaft of ulna, l arm, 7thN

This code signifies a left ulna shaft fracture that is broken into multiple segments and is no longer in proper alignment. It specifically indicates an open fracture (where the bone broke through the skin) of a severe nature (Type IIIA, IIIB, or IIIC) that has failed to heal properly after initial treatment. The "subsequent encounter" aspect means the patient is receiving ongoing care for this non-healing fracture.

Apply this code when documenting follow-up care for a patient with a previously diagnosed, severely open, multi-segmental fracture of the left ulnar shaft that has progressed to nonunion. This would be appropriate for encounters involving surgical intervention for nonunion, cast changes, or evaluation of the nonunion's status.

• Ensure documentation clearly specifies "left arm" and "ulna shaft" to differentiate from other forearm bones or locations.
• Verify the fracture type (IIIA, IIIB, or IIIC) is explicitly stated or clearly implied as a severe open fracture in the medical record.
• Confirm the encounter is for ongoing management of the nonunion, not the initial treatment of the fracture.