Restrictive allograft syndrome

Restrictive allograft syndrome refers to a chronic form of allograft dysfunction, typically seen in lung transplant recipients, characterized by progressive airway obstruction and fibrosis. This condition leads to a decline in lung function due to remodeling of the small airways and parenchyma of the transplanted organ. It is a significant cause of morbidity and mortality post-transplantation.

This code is used when documentation explicitly states "restrictive allograft syndrome" in a transplant recipient, particularly in the context of lung transplantation. It applies when there is evidence of progressive allograft dysfunction with features consistent with restrictive physiology, often confirmed by pulmonary function tests showing reduced lung volumes.

• Differentiate from other forms of chronic allograft dysfunction, such as bronchiolitis obliterans syndrome (BOS), which has distinct pathological and clinical features.
• Ensure documentation clearly specifies "restrictive allograft syndrome" rather than general allograft rejection or dysfunction.
• Consider sequencing with codes for the underlying transplant status (e.g., Z94.2 for lung transplant status) and any associated complications.