ICD-10 Code D84 – Other immunodeficiencies (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D84 – Other immunodeficiencies
What it is
D84 identifies immunodeficiency conditions that do not fit a more specific ICD-10 category. Use it when the record documents an immune system deficiency, but the exact type is not stated or does not have a dedicated code.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records may note recurrent or unusual infections, poor immune response, or other findings consistent with impaired immunity.
When to use this code
Use D84 when the provider documents an unspecified or other immunodeficiency and no more specific code applies. It may also fit when the chart confirms an immune deficiency disorder but lacks detail for a narrower code. Check the note for the exact diagnosis.
Do not use for
Do not use D84 when the documentation identifies a specific immunodeficiency with its own ICD-10 code. Also avoid it if the condition is only a risk factor or family history without a current diagnosis.
Coding tip
Code the most specific immunodeficiency documented; if the type is unclear, use D84 only after checking the record for a more precise diagnosis.