Lethal midline granuloma

This code represents a rare, aggressive, and often fatal destructive lesion primarily affecting the nasal cavity, paranasal sinuses, and palate. It is characterized by progressive ulceration, necrosis, and tissue destruction, often leading to facial disfigurement. Historically, it was considered a distinct entity, but it is now largely understood to be a form of extranodal NK/T-cell lymphoma, nasal type.

Use this code when documentation clearly indicates a diagnosis of lethal midline granuloma, particularly in historical records or when the specific lymphoma subtype is not yet definitively established. This diagnosis is typically made based on clinical presentation, imaging studies, and biopsy results showing characteristic tissue destruction and inflammatory infiltrate.

• Ensure documentation explicitly states "lethal midline granuloma" or a historical equivalent.
• If the underlying etiology is identified as extranodal NK/T-cell lymphoma, nasal type, a more specific ICD-9-CM code for that malignancy should be used instead.
• Consider sequencing this code as a primary diagnosis when it is the main reason for the encounter and treatment.