331.9
ICD-9-CMThis code signifies a progressive deterioration of brain tissue without a specific identified cause. It encompasses a broad category of neurological disorders characterized by the gradual loss of neuronal function and structure, leading to cognitive and motor impairments.
Utilize this code when documentation indicates a diagnosis of cerebral degeneration but lacks specific details regarding the type or etiology, such as Alzheimer's, Parkinson's, or Huntington's disease. This code is appropriate when the physician has not yet determined a more specific diagnosis or when the degeneration is truly unclassifiable.
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