ABO incompat w delayed hemolytic transfs react, sequela

This code signifies a long-term or residual effect stemming from a delayed hemolytic transfusion reaction caused by ABO incompatibility. This reaction occurs when a patient's immune system recognizes and attacks transfused red blood cells due to a mismatch in ABO blood types, with symptoms manifesting hours to days after the transfusion. The "sequela" indicates that the acute phase of the reaction has passed, but lasting complications or conditions persist.

Use this code when documenting a patient presenting with chronic or persistent health issues directly attributable to a past delayed hemolytic transfusion reaction due to ABO incompatibility. This includes conditions like chronic anemia, renal insufficiency, or other organ damage that developed as a consequence of the initial transfusion reaction. It should be applied after the acute phase of the reaction has resolved.

• This code is for the sequela (late effect), not the acute reaction.
• Requires a seventh character 'S' to indicate sequela.
• Always code the specific sequela (e.g., chronic anemia, renal failure) first, followed by this code as a secondary diagnosis.