| D84.0 | Lymphocyte function antigen-1 [LFA-1] defect | BILLABLE CODE |
| D84.1 | Defects in the complement system | BILLABLE CODE |
| D84.8 | Other specified immunodeficiencies | NON-BILLABLE CODE |
| D84.81 | Immunodeficiency due to conditions classified elsewhere | BILLABLE CODE |
| D84.82 | Immunodeficiency due to drugs and external causes | NON-BILLABLE CODE |
| D84.821 | Immunodeficiency due to drugs | BILLABLE CODE |
| D84.822 | Immunodeficiency due to external causes | BILLABLE CODE |
| D84.89 | Other immunodeficiencies | BILLABLE CODE |
| D84.9 | Immunodeficiency, unspecified | BILLABLE CODE |
