ICD-10 Code D84.0 – Lymphocyte function antigen-1 [LFA-1] defect (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D84.0 – Lymphocyte function antigen-1 [LFA-1] defect
What it is
D84.0 identifies a rare inherited immune disorder involving defective lymphocyte function antigen-1. This condition affects white blood cell adhesion and can impair normal immune responses.
Clinical signs
Clinical features vary; refer to documentation. Typical descriptions include recurrent bacterial infections, poor inflammatory response, and impaired leukocyte adhesion consistent with a primary immunodeficiency.
When to use this code
Use D84.0 when the provider documents LFA-1 defect, leukocyte adhesion abnormality, or a confirmed diagnosis of this specific immunodeficiency. It may also apply when the record clearly identifies the inherited disorder by name.
Do not code from suspicion alone. If the chart only says recurrent infections or immune dysfunction without a confirmed LFA-1 defect, Check documentation for the exact diagnosis.
Do not use for
Do not use this code for nonspecific immune deficiency, leukopenia, or other leukocyte adhesion disorders unless the record specifically names LFA-1 defect. Check documentation when the diagnosis is unclear.
Coding tip
Code D84.0 only when the provider documents the specific defect, not just a general immunodeficiency workup.