Specific code 2011 ICD-9-CM Diagnosis Code 331.9
Cerebral degeneration unspecified
  • Short description: Cereb degeneration NOS.
  • 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).
  • You are viewing the 2011 version of ICD-9-CM 331.9.
  • More recent version(s) of ICD-9-CM 331.9: 2012 2013 2014 2015.
Convert to ICD-10-CM: 331.9 converts approximately to:
  • 2015/16 ICD-10-CM G31.9 Degenerative disease of nervous system, unspecified
Disease Synonyms
  • Acquired cerebral atrophy
  • Cerebral atrophy, acquired
  • Degenerative brain disorder
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 2011 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.