ICD-10-CM > D50-D89 > D80-D89 > D89 D89 Other disorders involving the immune mechanism, not elsewhere classified Non-Billable/Non-Specific Type 1 Excludes hyperglobulinemia NOS (R77.1)monoclonal gammopathy (of undetermined significance) (D47.2) Type 2 Excludes transplant failure and rejection (T86.-) Codes D89.0Polyclonal hypergammaglobulinemiaD89.1CryoglobulinemiaD89.2Hypergammaglobulinemia, unspecifiedD89.3Immune reconstitution syndromeD89.4Mast cell activation syndrome and related disordersD89.40Mast cell activation, unspecifiedD89.41Monoclonal mast cell activation syndromeD89.42Idiopathic mast cell activation syndromeD89.43Secondary mast cell activationD89.44Hereditary alpha tryptasemiaD89.49Other mast cell activation disorderD89.8Other specified disorders involving the immune mechanism, not elsewhere classifiedD89.81Graft-versus-host diseaseD89.810Acute graft-versus-host diseaseD89.811Chronic graft-versus-host diseaseD89.812Acute on chronic graft-versus-host diseaseD89.813Graft-versus-host disease, unspecifiedD89.82Autoimmune lymphoproliferative syndrome [ALPS]D89.83Cytokine release syndromeD89.831Cytokine release syndrome, grade 1D89.832Cytokine release syndrome, grade 2D89.833Cytokine release syndrome, grade 3D89.834Cytokine release syndrome, grade 4D89.835Cytokine release syndrome, grade 5D89.839Cytokine release syndrome, grade unspecifiedD89.84IgG4-related diseaseD89.89Other specified disorders involving the immune mechanism, not elsewhere classifiedD89.9Disorder involving the immune mechanism, unspecified