ICD-10 Code D83.9 – Common variable immunodeficiency, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D83.9 – Common variable immunodeficiency, unspecified
What it is
D83.9 identifies common variable immunodeficiency when the record does not specify a more detailed subtype. It is a primary immune disorder marked by reduced antibody production and increased vulnerability to infection.
Clinical signs
Typical findings include recurrent sinopulmonary infections, chronic diarrhea, and poor response to routine vaccines. Clinical features vary; refer to documentation for the exact immune deficiency pattern.
When to use this code
Use D83.9 when the provider documents common variable immunodeficiency but does not identify a specific variant. It also fits records describing CVID with unspecified details, especially when only the general diagnosis is confirmed. If the note names another defined immunodeficiency, code that condition instead.
Do not use for
Do not use this code for transient, secondary, or medication-related immunodeficiency. Do not assign it when the chart supports a different specified primary immunodeficiency; check documentation.
Coding tip
Confirm that the provider explicitly documents CVID or common variable immunodeficiency before selecting D83.9.