Specific code 2012 ICD-9-CM Diagnosis Code 066.41
West Nile Fever with encephalitis
  • Short description: West Nile Fever w/enceph.
  • ICD-9-CM 066.41 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 066.41 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2012 version of ICD-9-CM 066.41.
  • More recent version(s) of ICD-9-CM 066.41: 2013 2014.
Disease Synonyms
  • West Nile encephalitis
  • West nile virus encephalitis
Applies To
  • West Nile encephalitis
  • West Nile encephalomyelitis
Convert to ICD-10-CM: 066.41 converts directly to:
  • 2014 ICD-10-CM A92.31 West Nile virus infection with encephalitis
ICD-9-CM Volume 2 Index entries containing back-references to 066.41:
  • Encephalitis (bacterial) (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) 323.9
    • West Nile type 066.41
  • Encephalomyelitis (chronic) (granulomatous) (myalgic, benign) (see also Encephalitis) 323.9
    • West Nile 066.41
  • Fever 780.60
  • West Nile
    • encephalitis 066.41
    • encephalomyelitis 066.41
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 066.41 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 2012 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.