ICD-10-CM > D50-D89 > D80-D89 > D81 > D81.3 D81.3 Adenosine deaminase [ADA] deficiency Non-Billable/Non-Specific Codes D81.30Adenosine deaminase deficiency, unspecifiedD81.31Severe combined immunodeficiency due to adenosine deaminase deficiencyD81.32Adenosine deaminase 2 deficiencyD81.39Other adenosine deaminase deficiency