ICD-10 Code D84.8 – Other specified immunodeficiencies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D84.8 – Other specified immunodeficiencies
What it is
D84.8 is used for an immunodeficiency that is documented, but does not fit a more specific ICD-10 category. It covers other specified defects of immune function when the record names the condition clearly.
Clinical signs
Clinical features vary; refer to documentation. Patients may have recurrent or unusual infections, poor immune response, or a known immune defect that is not otherwise classified.
When to use this code
Use D84.8 when the provider documents a specific immunodeficiency that is not captured by another code in the D84 series. It is appropriate when the diagnosis is established and the chart supports a distinct immune disorder. If the record is vague, check documentation before coding.
Do not use for
Do not use this code for unspecified immune disorders when a more specific code is available. Also avoid it for acquired immunodeficiency states that have their own ICD-10 code.
Coding tip
Code the most specific immunodeficiency documented, and query if the record only says “immune deficiency” or “immunocompromised.”