C85.10

HCC Category Mapping

What This Code Means

A cancer of B-cells (a type of immune cell) where the specific location of the cancer is not documented or specified.

Coding Tips

• •This is a less specific code; attempt to determine the anatomical site from clinical documentation before using this code
• •If site is documented, use the more specific C85.1x codes instead

Clinical Significance

Unspecified B-cell lymphoma at an unspecified site is a highly nonspecific code that should trigger a coding query whenever possible. B-cell lymphomas comprise approximately 85% of all non-Hodgkin lymphomas and have vastly different prognoses depending on subtype. This code should be considered a placeholder pending more specific pathology results and anatomical documentation.

Documentation Requirements

• ✓Pathology confirming B-cell lineage (CD20+, CD19+, PAX5+) — at minimum, immunohistochemistry results
• ✓Attempt to obtain specific B-cell subtype: diffuse large B-cell, follicular, mantle cell, marginal zone, Burkitt, etc.
• ✓Query for anatomical site of disease based on imaging or clinical examination findings
• ✓Staging workup results including CT/PET and bone marrow biopsy

Commonly Confused Codes