Fracture of vault of skull, subs for fx w nonunion

This code signifies a patient's ongoing treatment for a fracture located in the vault of the skull, specifically when the fracture has failed to heal properly (nonunion). It indicates that the patient is receiving care for the persistent unhealed bone fragments of the skull's upper portion.

This code is appropriate for follow-up encounters where a previously diagnosed skull vault fracture is documented as having nonunion. Documentation should clearly state "nonunion" or "failed healing" of the skull vault fracture, and the patient is receiving active treatment for this complication, such as surgical intervention or specialized wound care.

• Ensure documentation explicitly states "nonunion" and specifies the "vault of skull" as the fracture site.
• Distinguish from malunion (S02.0XXP), which implies healing in an incorrect anatomical position, versus nonunion, which implies no healing.
• Always sequence this code after any acute fracture codes (S02.0XXA) if the nonunion is being treated concurrently with initial fracture management.