D81.81 Biotin-dependent carboxylase deficiencyNon-billable header with 3 child codes.
D81.810 Biotinidase deficiencyD81.818 Other biotin-dependent carboxylase deficiencyD81.819 Biotin-dependent carboxylase deficiency, unspecifiedD72 Other disorders of white blood cells ("immunity disorders (D80-D89)")D84.81 Immunodeficiency due to conditions classified elsewhere ("certain disorders involving the immune mechanism (D80-D83, D84.0, D84.1, D84.9)")E79 Disorders of purine and pyrimidine metabolism ("combined immunodeficiency disorders (D81.-)")D81.4 Nezelof's syndromeD81.5 Purine nucleoside phosphorylase [PNP] deficiencyD81.6 Major histocompatibility complex class I deficiencyD81.7 Major histocompatibility complex class II deficiencyD81.8 Other combined immunodeficienciesD81.81 Biotin-dependent carboxylase deficiency (this code)D81.810 Biotinidase deficiencyD81.818 Other biotin-dependent carboxylase deficiencyD81.819 Biotin-dependent carboxylase deficiency, unspecifiedD81.82 Activated Phosphoinositide 3-kinase Delta Syndrome [APDS]D81.89 Other combined immunodeficiencies