combined immunodeficiencies combined immunodeficiencies combined immunodeficiencies (or combined immunity deficiency) are immunodeficiency disorders that involve multiple components of the immune system, including both humoral immunity and cell-mediated immunity. combined immunodeficienciesother namescombined immunity deficiencyspecialtyhematology this category includes conditions such as bare lymphocyte syndrome, as well as severe combined immunodeficiency. combined immunodeficiencies are commonly distinguished from scid by low but not absent t-cell function. icd-9 divides immune deficiencies into three categories: humoral (279.0), cell-mediated (279.1), and combined (279.2). however, icd-10 does not include a category for cell-mediated immune dysfunction (antibody is d80, and combined is d81), thus grouping t-cell mediated conditions with combined conditions.