C96.4

HCC Category Mapping

What This Code Means

A malignant tumor arising from dendritic cells, which are specialized immune cells that help the body recognize and fight infections.

Coding Tips

• •Dendritic cell sarcoma is rare; ensure diagnosis is confirmed by pathology
• •Document the primary site and extent of disease when available

Clinical Significance

Sarcoma of dendritic cells (accessory cells) is an extremely rare malignant tumor arising from dendritic cells, which are antigen-presenting cells of the immune system. Subtypes include follicular dendritic cell sarcoma and interdigitating dendritic cell sarcoma, each with distinct immunophenotypes and clinical behaviors, though both typically present as painless lymphadenopathy or soft tissue masses.

Documentation Requirements

• ✓Diagnosis requires biopsy with immunohistochemistry demonstrating dendritic cell markers (CD21, CD23, CD35 for follicular
• ✓S100, CD1a for interdigitating). Documentation should include the primary site, tumor size, staging workup results, surgical margins if resected, and planned adjuvant therapy. The specific dendritic cell subtype should be noted when identifiable.

Commonly Confused Codes