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2025 ICD-10-CM code D84.822

Immunodeficiency due to external causes.

Code Y84.2 (radiological procedure and radiotherapy as the cause of abnormal reaction of the patient, or of later complication, without mention of misadventure at the time of the procedure) may be reported in conjunction with D84.822. Codes for an external cause may also be reported in addition.

The medical necessity for using this code hinges on establishing a clear causal relationship between an external factor and the patient's immunodeficiency. This relationship should be supported by clinical findings and diagnostic test results.

IMPORTANT:Use additional code for external cause such as: exposure to ionizing radiation (W88)

In simple words: This code signifies a weakened immune system caused by factors outside the body, like radiation exposure.

Immunodeficiency due to external causes such as exposure to ionizing radiation (W88). Code also, if applicable, radiological procedure and radiotherapy (Y84.2).

Example 1: A patient develops immunodeficiency following radiation therapy for cancer., A patient working in a nuclear power plant experiences accidental exposure to radiation and subsequently develops immunodeficiency., A patient undergoing prolonged immunosuppressive therapy after an organ transplant develops immunodeficiency.

Documentation should clearly specify the external cause of the immunodeficiency, such as radiation exposure, specific medications, or other environmental factors. The clinical manifestations of the immunodeficiency should also be documented.

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