Acute on chronic graft-versus-host disease

This code signifies a specific form of graft-versus-host disease (GVHD) where an acute exacerbation occurs in a patient already experiencing chronic GVHD. It represents a worsening or new onset of acute GVHD symptoms superimposed on existing chronic manifestations following allogeneic hematopoietic stem cell transplantation.

Use this code when documentation clearly indicates a patient with established chronic GVHD develops new or worsening acute GVHD symptoms. This typically involves a recent increase in severity or new organ involvement characteristic of acute GVHD, in addition to ongoing signs of chronic GVHD.

• Ensure documentation explicitly states "acute on chronic" GVHD; avoid using this code for solely acute or solely chronic GVHD.
• Always sequence this code after the underlying condition requiring the transplant, if applicable, and any other relevant transplant complications.
• Distinguish carefully from D89.811 (Acute graft-versus-host disease) and D89.813 (Chronic graft-versus-host disease) based on the specific clinical presentation.