Intervertebral disc stenosis of neural canal of head region

This diagnosis code signifies a narrowing of the spinal canal within the head region, specifically caused by an intervertebral disc. This stenosis can compress the spinal cord or nerve roots, leading to neurological symptoms. It describes a structural abnormality affecting the neural canal at the craniocervical junction or within the skull base.

Use this code when documentation clearly indicates a diagnosis of intervertebral disc stenosis affecting the neural canal in the head region. This typically involves imaging findings (e.g., MRI, CT) demonstrating disc protrusion or herniation causing canal narrowing at the C0-C1 or C1-C2 levels, or within the foramen magnum. Supporting documentation should specify the disc as the causative factor.

• Ensure documentation explicitly states "intervertebral disc" as the cause of stenosis in the head region, not bone or ligamentous hypertrophy.
• Distinguish from cervical spinal stenosis (M99.51) if the stenosis is clearly below the C1 level.
• Always sequence this code as a primary diagnosis if it is the reason for the encounter, or as a secondary diagnosis if it is a co-morbidity impacting treatment.