Mismatched blood in transfusion

This code signifies an adverse event where a patient receives a blood transfusion containing blood components that are incompatible with their own, such as an incorrect ABO or Rh type. This incompatibility can lead to a severe transfusion reaction, including hemolysis, renal failure, and even death.

Assign this code when documentation clearly indicates that a patient experienced a transfusion reaction due to the administration of mismatched blood. This typically occurs when there is an error in blood typing, cross-matching, or patient identification during the transfusion process.

• Always sequence this code as a secondary diagnosis, following the code for the specific transfusion reaction (e.g., T80.3-).
• Ensure the medical record explicitly states "mismatched blood" or similar terminology indicating an incompatibility error, not just a general adverse reaction.
• Do not use this code for other types of transfusion complications not related to blood incompatibility.