ICD-10-CM > D50-D89 > D80-D89 > D84 D84 Other immunodeficiencies Non-Billable/Non-Specific Codes D84.0Lymphocyte function antigen-1 [LFA-1] defectD84.1Defects in the complement systemD84.8Other specified immunodeficienciesD84.81Immunodeficiency due to conditions classified elsewhereD84.82Immunodeficiency due to drugs and external causesD84.821Immunodeficiency due to drugsD84.822Immunodeficiency due to external causesD84.89Other immunodeficienciesD84.9Immunodeficiency, unspecified