Subacute combined degeneration of spinal cord in diseases classified elsewhere

This code describes a neurological condition characterized by progressive degeneration of the dorsal and lateral columns of the spinal cord, along with peripheral nerve involvement. It is primarily caused by severe vitamin B12 deficiency, leading to impaired myelin synthesis and subsequent neurological dysfunction.

Use this code for patients diagnosed with subacute combined degeneration of the spinal cord where the underlying cause is documented as a disease classified elsewhere. This typically applies when the B12 deficiency is secondary to conditions like pernicious anemia, Crohn's disease, or gastric bypass surgery. Documentation should clearly link the spinal cord degeneration to an underlying systemic disease.

• Always code the underlying disease (e.g., pernicious anemia, malabsorption syndrome) first, as this code is for a manifestation in diseases classified elsewhere.
• Ensure documentation specifies "subacute combined degeneration" and not just general myelopathy or neuropathy.
• Do not use this code if the cause of the spinal cord degeneration is not linked to a disease classified elsewhere; consider codes for other forms of myelopathy.