Oth disp fx of first cervcal vert, subs for fx w nonunion

This code signifies a non-healing fracture of the atlas (first cervical vertebra) that is displaced, meaning the bone fragments are not properly aligned. This specific code is used when the patient is receiving active treatment for the nonunion, such as surgical intervention or prolonged immobilization, after the initial treatment phase.

Apply this code for a patient presenting for ongoing management of a previously diagnosed, displaced C1 fracture that has failed to heal (nonunion). Documentation should clearly state "nonunion" of a displaced C1 fracture and indicate that this is a subsequent encounter for treatment of this specific complication.

• Ensure documentation specifies "displaced" and "nonunion" for the first cervical vertebra.
• Do not use for initial fracture treatment or for malunion (healed in a deformed position).
• Always sequence this code after any underlying cause or complication if applicable, but typically it will be a primary diagnosis for the encounter.