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Certain disorders involving the immune system

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01

Disorders in which disturbed immune regulation plays an important part but which cannot be more precisely located elsewhere in the classification.

exclusions

• Monoclonal gammopathy of undetermined significance  (2A83.0)
• Failure or rejection of transplanted organs or tissues  (NE84)

code elsewhere

• Hereditary angioedema  (4A00.14)

sections/codes in this section (4B20-4B2Y)

• Sarcoidosis  (4B20)
• Polyclonal hypergammaglobulinaemia  (4B21)
• Cryoglobulinaemia  (4B22)
• Immune reconstitution inflammatory syndrome  (4B23)
• Graft-versus-host disease  (4B24)
• Other specified disorders involving the immune system  (4B2Y)

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