Systemic atrophy aff cnsl in oth diseases classd elswhr

This code signifies a condition where there is widespread degeneration of the central nervous system, primarily affecting brain and spinal cord tissue, that is a manifestation or complication of another underlying disease. It indicates that the neurological atrophy is not the primary diagnosis but rather a secondary effect of a separate, specified illness.

Apply this code when documentation clearly links systemic CNS atrophy to an underlying disease classified elsewhere, such as a metabolic disorder, chronic infection, or toxic encephalopathy. The medical record should specify both the CNS atrophy and the primary condition causing it.

• Always sequence the underlying disease first, as this code is for a manifestation of another condition.
• Ensure the documentation explicitly states the CNS atrophy is "due to" or "secondary to" another specified disease.
• Do not use this code for primary neurodegenerative disorders where CNS atrophy is the main disease process (e.g., Alzheimer's, Parkinson's).