| Full description | Severe combined immunodeficiency [SCID] with low T- and B-cell numbers |
| Billable | Yes |
| Chapter | Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) |
| Section | Certain disorders involving the immune mechanism (D80-D89) |
| Parent code | D81 — Combined immunodeficiencies |