C96.6 – Unifocal Langerhans-cell histiocytosis
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of lymphoid, hematopoietic and related tissue
- Code
C96.6(claims format:C966)- Description
- Unifocal Langerhans-cell histiocytosis
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue
- Parent codes
- C96
Notes for C96.6
- Eosinophilic granuloma
- Histiocytosis X, unifocal
- Histiocytosis X NOS
- Langerhans-cell histiocytosis NOS
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C96 – Other and unspecified malignant neoplasms of lymphoid, hematopoietic and related tissue
- personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues (Z85.79)
Block C81-C96
Index terms for C96.6
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Histiocytosis, X NEC
- Granuloma, bone, lung
- Granuloma, eosinophilic
- Granuloma, bone, eosinophilic
- Granuloma, eosinophilic, bone
- Granuloma, eosinophilic, lung
- Granuloma, lung, eosinophilic
- Histiocytosis, X NEC, chronic
- Histiocytosis, X NEC, unifocal
- Histiocytosis, Langerhans' cell NEC
- Histiocytosis, Langerhans' cell NEC, unifocal
- Histiocytosis, mononuclear phagocytes NEC, Langerhans' cells
Related codes in C96
- C96.0 – Multifocal and multisystemic (disseminated) Langerhans-cell histiocytosisBillable
- C96.2 – Malignant mast cell neoplasmHeader
- C96.4 – Sarcoma of dendritic cells (accessory cells)Billable
- C96.5 – Multifocal and unisystemic Langerhans-cell histiocytosisBillable
- C96.A – Histiocytic sarcomaBillable
- C96.Z – Other specified malignant neoplasms of lymphoid, hematopoietic and related tissueBillable
- C96.9 – Malignant neoplasm of lymphoid, hematopoietic and related tissue, unspecifiedBillable
Frequently asked questions
What is ICD-10 code C96.6?
C96.6 is the ICD-10-CM code for unifocal Langerhans-cell histiocytosis, in the block C81-C96 (Malignant neoplasms of lymphoid, hematopoietic and related tissue).
Is C96.6 a billable code?
Yes. C96.6 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does C96.6 belong to?
It belongs to category C96 – Other and unspecified malignant neoplasms of lymphoid, hematopoietic and related tissue.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.