Unstable burst fracture of first cervical vertebra, init

This diagnosis code signifies a severe, unstable fracture of the C1 vertebra (atlas) where the bone is shattered or fragmented, often due to significant axial loading. "Unstable" indicates a high risk of spinal cord or nerve root compromise, while "closed" means the skin remains intact over the fracture site.

Apply this code for initial encounters involving patients presenting with an unstable C1 burst fracture, confirmed by imaging (e.g., CT scan). Documentation should clearly state the fracture's location, its burst morphology, and its unstable nature, along with the "initial encounter" for treatment.

• Ensure documentation explicitly states "unstable" and "burst" fracture of the C1 vertebra.
• Verify that this is the patient's initial encounter for this specific injury. Subsequent care would require a different encounter character.
• Distinguish from stable C1 fractures (e.g., Jefferson fracture without instability) or fractures of other cervical vertebrae.