Unstbl burst fx first cervcal vert, subs for fx w delay heal

This code signifies an unstable burst fracture of the C1 vertebra (atlas) that is currently in a phase of delayed healing. An unstable burst fracture involves comminution of the vertebral body and disruption of the anterior and posterior arches, indicating significant spinal instability. Delayed healing means the fracture is taking longer than expected to unite.

Use this code for follow-up encounters where a patient with a previously diagnosed unstable C1 burst fracture is being managed for delayed healing. Documentation should clearly state "unstable burst fracture," "C1," and explicitly mention "delayed healing" or provide clinical evidence (e.g., imaging reports, physician notes) supporting delayed union.

• Ensure documentation specifies "unstable" and "burst fracture" for C1, as other C1 fracture types exist.
• The "G" seventh character indicates subsequent encounter for fracture with delayed healing; do not confuse with routine healing ("D") or nonunion ("K").
• Always sequence this code as the primary diagnosis if it is the reason for the encounter.