ABO incompatibility w hemolytic transfs react, unsp, init

This code signifies an adverse immune response to a blood transfusion due to an incompatibility in the ABO blood group system, resulting in the destruction of red blood cells. The specific type of hemolytic transfusion reaction is not documented, and this code is used for the initial presentation of the event.

Use this code when a patient experiences their first documented hemolytic transfusion reaction caused by ABO incompatibility, and the specific type of reaction (e.g., acute, delayed) is not specified in the medical record. This applies to situations where the patient is actively being treated for the immediate effects of the reaction.

• Ensure documentation explicitly states ABO incompatibility as the cause of the hemolytic transfusion reaction.
• Only use the "A" seventh character for the initial encounter during the active treatment phase of the reaction.
• If the specific type of hemolytic reaction is known (e.g., acute, delayed), a more specific code should be chosen.