Spondylolisthesis, occipito-atlanto-axial region

This code describes the anterior or posterior displacement of one vertebra over another specifically within the occipito-atlanto-axial region of the cervical spine. This instability can lead to neurological symptoms due to spinal cord or nerve root compression.

Use this code when documentation clearly indicates a spondylolisthesis affecting the junction between the skull (occiput), the first cervical vertebra (atlas), and the second cervical vertebra (axis). This diagnosis is typically supported by imaging studies such as X-rays, CT scans, or MRI, along with clinical findings of neck pain, instability, or neurological deficits.

• Ensure the documentation specifies the occipito-atlanto-axial region; other spinal regions have different codes.
• Distinguish from spondylolysis, which is a defect in the pars interarticularis without displacement.
• Code any associated neurological manifestations (e.g., myelopathy, radiculopathy) separately.