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

This code signifies a fracture of the fourth cervical vertebra that is out of its normal alignment and has failed to heal after a previous treatment attempt. The "subsequent encounter" indicates that the patient is receiving follow-up care for this non-healing fracture.

Apply this code when a patient presents for ongoing management of a previously diagnosed and treated displaced C4 vertebral fracture that has not united. Documentation should clearly state "nonunion" or "failed healing" of the fracture. This code is appropriate for office visits, hospital admissions, or surgical encounters related to the nonunion.

• Ensure documentation explicitly states "nonunion" and "displaced" for the C4 fracture.
• Verify that this is a subsequent encounter, not the initial treatment for the fracture.
• Distinguish from malunion (S12.390P) where the fracture has healed but in an unsatisfactory position.