| D89 | Other disorders involving the immune mechanism, not elsewhere classified |
| D890 | Polyclonal hypergammaglobulinemia |
| D891 | Cryoglobulinemia |
| D892 | Hypergammaglobulinemia, unspecified |
| D893 | Immune reconstitution syndrome |
| D894 | Mast cell activation syndrome and related disorders |
| D8940 | Mast cell activation, unspecified |
| D8941 | Monoclonal mast cell activation syndrome |
| D8942 | Idiopathic mast cell activation syndrome |
| D8943 | Secondary mast cell activation |
| D8944 | Hereditary alpha tryptasemia |
| D8949 | Other mast cell activation disorder |
| D898 | Other specified disorders involving the immune mechanism, not elsewhere classified |
| D8981 | Graft-versus-host disease |
| D89810 | Acute graft-versus-host disease |
| D89811 | Chronic graft-versus-host disease |
| D89812 | Acute on chronic graft-versus-host disease |
| D89813 | Graft-versus-host disease, unspecified |
| D8982 | Autoimmune lymphoproliferative syndrome [ALPS] |
| D8983 | Cytokine release syndrome |
| D89831 | Cytokine release syndrome, grade 1 |
| D89832 | Cytokine release syndrome, grade 2 |
| D89833 | Cytokine release syndrome, grade 3 |
| D89834 | Cytokine release syndrome, grade 4 |
| D89835 | Cytokine release syndrome, grade 5 |
| D89839 | Cytokine release syndrome, grade unspecified |
| D8984 | IgG4-related disease |
| D8989 | Other specified disorders involving the immune mechanism, not elsewhere classified |
| D899 | Disorder involving the immune mechanism, unspecified |
| E00 | Congenital iodine-deficiency syndrome |
| E000 | Congenital iodine-deficiency syndrome, neurological type |
| E001 | Congenital iodine-deficiency syndrome, myxedematous type |
| E002 | Congenital iodine-deficiency syndrome, mixed type |
| E009 | Congenital iodine-deficiency syndrome, unspecified |
| E01 | Iodine-deficiency related thyroid disorders and allied conditions |
| E010 | Iodine-deficiency related diffuse (endemic) goiter |
| E011 | Iodine-deficiency related multinodular (endemic) goiter |
| E012 | Iodine-deficiency related (endemic) goiter, unspecified |
| E018 | Oth iodine-deficiency related thyroid disord and allied cond Other iodine-deficiency related thyroid disorders and allied conditions |
| E02 | Subclinical iodine-deficiency hypothyroidism |
| E03 | Other hypothyroidism |
| E030 | Congenital hypothyroidism with diffuse goiter |
| E031 | Congenital hypothyroidism without goiter |
| E032 | Hypothyroidism due to medicaments and other exogenous substances |
| E033 | Postinfectious hypothyroidism |
| E034 | Atrophy of thyroid (acquired) |
| E035 | Myxedema coma |
| E038 | Other specified hypothyroidism |
| E039 | Hypothyroidism, unspecified |
| E04 | Other nontoxic goiter |