Non-ABO incompat w hemolytic transfs react, unsp, init

This code signifies an adverse immune response to a blood transfusion that is not related to the major ABO blood group system. It involves the destruction of red blood cells (hemolysis) due to antibodies against other red blood cell antigens, with the specific incompatibility type not yet identified. This reaction occurs during or shortly after the initial transfusion event.

Assign this code when a patient experiences a hemolytic transfusion reaction where the incompatibility is confirmed to be non-ABO, but the precise antigen causing the reaction (e.g., Rh, Kell, Duffy) has not been determined. This is appropriate for the initial presentation and management of such a reaction.

• Ensure documentation clearly states a "hemolytic transfusion reaction" and specifies "non-ABO incompatibility."
• Only use this code for the initial encounter for this specific reaction. Subsequent encounters would require a different seventh character.
• Do not use if the specific non-ABO incompatibility (e.g., Rh incompatibility) is identified; a more specific code would then be appropriate.