Nonfamilial hypogammaglobulinemia

This code represents a primary immunodeficiency characterized by abnormally low levels of all immunoglobulin classes (IgG, IgA, IgM) that is not inherited. Patients typically present with recurrent bacterial infections, particularly of the respiratory and gastrointestinal tracts, due to impaired humoral immunity.

Use this code for patients diagnosed with a generalized deficiency of immunoglobulins that is acquired rather than genetic. Documentation should clearly state "nonfamilial" or "acquired" hypogammaglobulinemia, often following extensive workup to rule out secondary causes. This diagnosis is typically made by an immunologist.

• Distinguish carefully from transient hypogammaglobulinemia of infancy or secondary hypogammaglobulinemia due to other conditions (e.g., malignancy, protein-losing enteropathy).
• Ensure documentation specifies the nonfamilial nature; otherwise, consider codes for unspecified hypogammaglobulinemia or other primary immunodeficiencies.
• Code any associated infections or complications (e.g., recurrent pneumonia, bronchiectasis) as additional diagnoses.