04
chapter
Diseases of the immune system
Exclusions
11 subordinate codes
4A00-4A0ZPrimary immunodeficiencies4A20Acquired immunodeficiencies4A40-4A4ZNonorgan specific systemic autoimmune disorders4A60-4A6ZAutoinflammatory disorders4A80-4A8ZAllergic or hypersensitivity conditions4B00-4B0ZImmune system disorders involving white cell lineages4B20-4B2YCertain disorders involving the immune system4B40Diseases of thymus- Organ specific autoimmune disorders
4B4YOther specified diseases of the immune system4B4ZDiseases of the immune system, unspecified