Specific code 2015 ICD-9-CM Diagnosis Code 279.9
Unspecified disorder of immune mechanism
  • 2015
  • Billable Thru Sept 30/2015
  • Non-Billable On/After Oct 1/2015

  • ICD-9-CM 279.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 279.9 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).
Convert to ICD-10-CM: 279.9 converts directly to:
  • 2015/16 ICD-10-CM D89.9 Disorder involving the immune mechanism, unspecified
Disease Synonyms
  • Disorder of immune function
  • Immune system disorder
  • Immunosuppression
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 2015 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.