Striatonigral degeneration

This code represents a rare, progressive neurodegenerative disorder characterized by the degeneration of neurons in the striatum and substantia nigra. It is a form of multiple system atrophy (MSA) primarily affecting motor function, often presenting with parkinsonism that is poorly responsive to levodopa.

Use this code for patients diagnosed with striatonigral degeneration, a specific subtype of MSA. Documentation should clearly indicate the diagnosis of striatonigral degeneration, often supported by neurological examination findings and imaging (e.g., MRI) consistent with MSA-P (parkinsonian type).

• Differentiate from other forms of parkinsonism, such as Parkinson's disease, which has distinct ICD-10-CM codes.
• Consider co-occurring autonomic dysfunction, which is common in MSA and may require additional codes.
• Ensure documentation specifies "striatonigral degeneration" rather than just general "multiple system atrophy" if this specific subtype is confirmed.