Specific code 2013 ICD-9-CM Diagnosis Code 279.9
Unspecified disorder of immune mechanism
  • Short description: Immune mechanism dis NOS.
  • ICD-9-CM 279.9 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 279.9 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
  • You are viewing the 2013 version of ICD-9-CM 279.9.
  • More recent version(s) of ICD-9-CM 279.9: 2014.
Disease Synonyms
  • Disorder of immune function
  • Immune system disorder
  • Immunosuppression
Convert to ICD-10-CM: 279.9 converts directly to:
  • 2014 ICD-10-CM D89.9 Disorder involving the immune mechanism, unspecified
ICD-9-CM Volume 2 Index entries containing back-references to 279.9:
  • Disease, diseased - see also Syndrome
    • immunologic NEC 279.9
  • Disorder - see also Disease
    • immune mechanism (immunity) 279.9
      • single complement (C1-C9) 279.8
      • specified type NEC 279.8
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 279.9 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 2013 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.