C96.6
ICD-10BillableUnifocal Langerhans-cell histiocytosis
Official ICD-10-CM descriptor (FY2026)
Unifocal Langerhans-cell histiocytosis
C96.6 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Eosinophilic granuloma
- Histiocytosis X, unifocal
- Histiocytosis X NOS
- Langerhans-cell histiocytosis NOS
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- multifocal and multisysemic (disseminated) Langerhans-cell histiocytosis (C96.0)
- multifocal and unisystemic Langerhans-cell histiocytosis (C96.5)
Related codes in C96
- C96.0Multifocal and multisystemic Langerhans-cell histiocytosis
- C96.2Malignant mast cell neoplasmcategory
- C96.4Sarcoma of dendritic cells (accessory cells)
- C96.5Multifocal and unisystemic Langerhans-cell histiocytosis
- C96.AHistiocytic sarcoma
- C96.ZOth malig neoplm of lymphoid, hematpoetc and related tissue
- C96.9Malig neoplm of lymphoid, hematpoetc and rel tissue, unsp
Where this code sits
- Chapter
- 2. Neoplasms (C00-D49)
- Parent code
- C96
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.