279 Disorders involving the immune mechanism (279.00-279.9) ICD-9-CM
The 279.00-279.9 block classified 279 disorders involving the immune mechanism with 23 legacy diagnosis codes. None remain valid for claim submission; each code below links to its reference page with the official ICD-10-CM replacement under the CMS General Equivalence Mappings.
Retired Code Set
ICD-9-CM stopped being valid for U.S. claims with dates of service on or after October 1, 2015, when ICD-10-CM replaced it. Use this index for historical lookups and crosswalking; for current coding, start from the ICD-10-CM codes list or the ICD-9 / ICD-10 converter.
Legacy Codes in the 279.00-279.9 Block 23 codes
None of these codes remain valid for claim submission. Each code page shows its ICD-10-CM replacement under the CMS General Equivalence Mappings.
- 279.00 Hypogammaglobulinem NOS
- 279.01 Selective iga immunodef
- 279.02 Selective IgM immunodef
- 279.03 Selective ig defic NEC
- 279.04 Cong hypogammaglobulinem
- 279.05 Immunodefic w hyper-igm
- 279.06 Common variabl immunodef
- 279.09 Humoral immunity def NEC
- 279.10 Immundef t-cell def NOS
- 279.11 Digeorge's syndrome
- 279.12 Wiskott-aldrich syndrome
- 279.13 Nezelof's syndrome
- 279.19 Defic cell immunity NOS
- 279.2 Combined immunity defic
- 279.3 Immunity deficiency NOS
- 279.41 Autoimmun lymphprof synd
- 279.49 Autoimmune disease NEC
- 279.50 Graft-versus-host NOS
- 279.51 Ac graft-versus-host dis
- 279.52 Chronc graft-vs-host dis
- 279.53 Ac on chrn grft-vs-host
- 279.8 Immune mechanism dis NEC
- 279.9 Immune mechanism dis NOS
Questions About This Page
Are the 279.00-279.9 codes still billable?
No. Every code in this block became invalid for U.S. claims after September 30, 2015. Each code page linked above shows the ICD-10-CM replacement CMS assigned in the General Equivalence Mappings, and the ICD-9 / ICD-10 converter translates any of them directly.
What did the 279.00-279.9 block classify?
The block classified 279 disorders involving the immune mechanism with 23 codes in the final ICD-9-CM release. It sat under Endocrine, nutritional and metabolic diseases, and immunity disorders (240–279) in the legacy hierarchy.
Related References
Source: final CMS ICD-9-CM release (version date October 1, 2014). Retired from U.S. claims after September 30, 2015.
