ICD-9-CM 331.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 331.9 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
2015/16 ICD-10-CM G31.9 Degenerative disease of nervous system, unspecified
Approximate Synonyms
Acquired cerebral atrophy
Cerebral atrophy, acquired
Degenerative brain disorder
Clinical Information
Result of genetic metabolic defects or damage by exogenous or endogenous toxins; characterized by cerebral cortex atrophy and progressive cerebral demyelination; dementia and mental deterioration are common