ABO incompatibility w delayed hemolytic transfs react, subs

This code signifies a delayed hemolytic transfusion reaction (DHTR) occurring due to ABO incompatibility, where the patient's immune system reacts to transfused red blood cells from a donor with an incompatible ABO blood type. This reaction manifests days to weeks after the transfusion, leading to the destruction of the transfused red blood cells.

Apply this code when documenting a patient's follow-up visit or subsequent care for a previously diagnosed delayed hemolytic transfusion reaction caused by ABO incompatibility. This includes monitoring for ongoing hemolysis, managing complications, or evaluating treatment effectiveness after the initial acute phase.

• Ensure documentation clearly states "delayed" and specifies "ABO incompatibility" as the cause.
• This specific code is for a subsequent encounter; use the appropriate initial encounter code for the first diagnosis.
• Always code any associated signs, symptoms, or complications of the reaction, such as anemia or renal dysfunction, in addition to this code.