Immunodef fol heredit defctv response to Epstein-Barr virus

This code identifies a primary immunodeficiency disorder characterized by a genetic defect leading to an impaired immune response specifically to the Epstein-Barr virus (EBV). Patients with this condition often experience severe, recurrent, or persistent EBV infections, which can manifest as lymphoproliferative disorders, hemophagocytic lymphohistiocytosis (HLH), or other life-threatening complications.

Use this code for patients diagnosed with a hereditary immunodeficiency where the underlying genetic defect specifically impacts their ability to control EBV infection. Documentation should clearly state a genetic basis for the immunodeficiency and its direct link to an abnormal response to EBV, often confirmed by genetic testing or a strong family history.

• Ensure documentation specifies "hereditary" or "genetic" and explicitly links the immunodeficiency to EBV.
• Do not use for general or acquired immunodeficiencies not specifically tied to a hereditary defective response to EBV.
• Consider sequencing this code as a primary diagnosis when the immunodeficiency is the focus of care, followed by codes for any manifestations of the EBV infection.