Non-ABO incompatibility reaction due to transfusion of blood or blood products, unspecified, initial encounter

T80.A0XA (“Non-ABO incompatibility reaction due to transfusion of blood or blood products, unspecified, initial encounter”) is a diagnosis code that identifies a specific condition, injury, or finding on a medical claim in the ICD-10-CM code set. Whether it is billed — and whether a payer covers it — depends on the clinical setting, documentation, and plan rules.