2025 ICD-10-CM code D84.822
Immunodeficiency due to external causes.
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.
- Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
- D84 Other immunodeficienciesD84.8 Other specified immunodeficienciesD84.82 Immunodeficiency due to drugs and external causesD84.822 Immunodeficiency due to external causes
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.
- Specialties:Immunology, Oncology, Internal Medicine, Hematology