ABO incompatibility w delayed hemolytic transfs react, init

This code signifies a delayed hemolytic transfusion reaction (DHTR) caused by an ABO incompatibility, occurring after a blood transfusion. This type of reaction involves the recipient's immune system attacking the transfused red blood cells due to a mismatch in ABO blood types, with symptoms typically appearing 24 hours to 28 days post-transfusion.

Use this code for a patient experiencing their first episode of a delayed hemolytic reaction specifically attributed to an ABO blood type mismatch following a transfusion. This applies when the patient is initially presenting for evaluation and management of this specific transfusion complication.

• Ensure documentation clearly specifies ABO incompatibility as the cause of the delayed hemolytic reaction.
• Verify that this is the patient's initial encounter for this specific transfusion reaction. Subsequent encounters would use a different seventh character.
• Always code the underlying condition requiring the transfusion, if applicable, in addition to this complication code.