2025 ICD-10-CM Diagnosis Code C86.40

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

Clinical Information

• Blastic Plasmacytoid Dendritic Cell Neoplasm

  a rare and aggressive hematologic malignancy derived from the precursors of plasmacytoid dendritic cells. blastic plasmacytoid dendritic cell neoplasms affect bone marrow and blood in addition to the lymph nodes, spleen, central nervous system, and skin.

New 2025 ICD-10-CM Code

C86.40 is new to ICD-10-CM code set for the FY 2025, effective October 1, 2024. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2024. This is a new and revised code for the FY 2025 (October 1, 2024 - September 30, 2025).

C86.40 is grouped with Diagnostic Related Groups - MS-DRG Mapping

Diagnosis-Related Groups (DRGs) are used to classify hospital cases for billing and healthcare management. They help standardize how hospitals and other providers are reimbursed for inpatient care. Patients are grouped based on their principal diagnosis into broader categories called Major Diagnostic Categories (MDCs).

Once assigned to a DRG, the hospital receives a set payment for the patient’s care, regardless of the actual services provided. This fixed rate is intended to cover the typical cost of treating patients within that group. The payment amount depends on the DRG's relative weight, which reflects the expected complexity and cost of care based on the severity of the patient’s condition.

Diagnostic related groups encourage healthcare providers to focus on quality and efficiency in patient care while managing costs effectively. The diagnosis code is present in the following groups for version MS-DRG V42.0 applicable from 10/01/2024 through 09/30/2025.

Replacement Code

C8640 replaces the following previously assigned ICD-10-CM code(s):

• C86.4 - Blastic NK-cell lymphoma

Code History