Stable burst fx first cervcal vert, subs for fx w nonunion

This code signifies a stable burst fracture of the C1 vertebra (atlas) that has failed to heal properly after initial treatment. "Stable" indicates the fracture does not compromise spinal cord integrity, while "nonunion" means the bone fragments have not fused. This is a follow-up encounter for ongoing management of the nonunion.

Apply this code for patients presenting for follow-up care of a previously diagnosed stable C1 burst fracture where imaging and clinical assessment confirm nonunion. Documentation should clearly state "nonunion" and specify the encounter as "subsequent" for the fracture.

• Ensure documentation explicitly states "nonunion" and the encounter type (subsequent).
• Do not use for initial treatment of the fracture or for malunion (improper healing).
• Verify the stability of the fracture; unstable fractures of C1 would use different codes.