D84.8Other specified immunodeficiencies

D84.8 is the ICD-10-CM diagnosis code for other specified immunodeficiencies. It belongs to category D84 (other immunodeficiencies), block D80-D89 (certain disorders involving the immune mechanism) and chapter 3 (diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within D84, choose D84.8 (Other specified immunodeficiencies) only when documentation doesn't support a more specific option: lymphocyte function antigen-1 [LFA-1] defect (D84.0), defects in the complement system (D84.1) and immunodeficiency, unspecified (D84.9).

To report this condition, pick the subcode that matches the documentation: D84.81 (elsewhere), D84.82 (causes) and D84.89 (immunodeficiencies).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2021 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 279.10 (immunodeficiency with predominant T-cell defect, unspecified), 279.19 (other deficiency of cell-mediated immunity) and 279.3 (unspecified immunity deficiency).