Displaced posterior arch fx first cervcal vertebra, init

This code signifies a fracture of the posterior arch of the C1 vertebra (atlas) where the bone fragments are no longer in their anatomical alignment. This injury is typically caused by axial loading or hyperextension forces on the cervical spine. It represents the initial treatment phase for this specific type of closed fracture.

Apply this code when documentation confirms a displaced fracture of the posterior arch of the C1 vertebra. This is appropriate for the initial encounter for treatment of a closed fracture, meaning the skin over the fracture site remains intact. Supporting documentation would include imaging reports (X-ray, CT scan) detailing the fracture location, displacement, and the initial phase of care.

• Ensure documentation specifies "displaced" and "posterior arch" of C1; otherwise, an unspecified or non-displaced code may be more appropriate.
• Verify the encounter is for the initial treatment of the fracture; subsequent encounters will require different seventh characters.
• Confirm the fracture is "closed"; open fractures have distinct coding pathways.