Specific code 2015 ICD-9-CM Diagnosis Code 331.9
Cerebral degeneration, unspecified
  • 2015
  • Billable Code
  • ICD-9-CM 331.9 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 331.9 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • 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
Convert to ICD-10-CM: 331.9 converts approximately to:
  • 2015 ICD-10-CM G31.9 Degenerative disease of nervous system, unspecified
ICD-9-CM Volume 2 Index entries containing back-references to 331.9:
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 331.9 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.