D81 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Combined immunodeficiencies.
Autosomal recessive agammaglobulinemia (Swiss type) (D80.0)
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Severe combined immunodeficiency [SCID] with reticular dysgenesis
Severe combined immunodeficiency [SCID] with low T- and B-cell numbers
Severe combined immunodeficiency [SCID] with low or normal B-cell numbers
Adenosine deaminase [ADA] deficiency
Nezelof's syndrome
Purine nucleoside phosphorylase [PNP] deficiency
Major histocompatibility complex class I deficiency
Major histocompatibility complex class II deficiency
Other combined immunodeficiencies
Combined immunodeficiency, unspecified
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