ICD-10-CM > C00-D49 > C81-C96 > C96 > C96.6 C96.6 Unifocal Langerhans-cell histiocytosis Billable/Specific Copy Code Copy Description Applicable To Eosinophilic granulomaHistiocytosis X, unifocalHistiocytosis X NOSLangerhans-cell histiocytosis NOS Type 1 Excludes multifocal and multisysemic (disseminated) Langerhans-cell histiocytosis (C96.0)multifocal and unisystemic Langerhans-cell histiocytosis (C96.5)