Delayed hemolytic transfs react, unsp incompatibility, init

This code signifies a delayed adverse immune response to a blood transfusion, resulting in the destruction of red blood cells, where the specific cause of the incompatibility is not yet identified. The reaction manifests more than 24 hours after the transfusion and can lead to symptoms such as fever, jaundice, and anemia.

Apply this code when a patient presents with signs and symptoms of a delayed hemolytic transfusion reaction, and the laboratory investigation into the specific incompatible antigen-antibody interaction is either pending or inconclusive. This code is appropriate for the initial encounter during which the reaction is first diagnosed and managed.

• Ensure documentation clearly states the reaction is delayed and the incompatibility is unspecified.
• This code is for the initial encounter; subsequent encounters for the same reaction would require a different seventh character.
• Always review the full medical record to confirm the timing of the reaction relative to the transfusion.