C85.11

HCC Category Mapping

What This Code Means

This code describes a type of cancer that starts in B-cells (a type of white blood cell) and affects the lymph nodes in the head, neck, and face area, but the specific subtype of B-cell lymphoma has not been identified. It is used when the exact type of B-cell lymphoma cannot be determined or specified.

Coding Tips

• •Verify that the lymphoma is confirmed to be B-cell type and located in head, face, or neck lymph nodes before assigning this code; if a more specific B-cell lymphoma subtype is documented (such as diffuse large B-cell lymphoma), use the more specific code instead
• •This is an unspecified code (indicated by the fifth character '1'), so query the provider if additional diagnostic information is available that would allow for a more specific B-cell lymphoma classification

Clinical Significance

Unspecified B-cell lymphoma involving lymph nodes of head, face, and neck identifies the anatomical location but lacks specific subtype classification. B-cell lymphoma subtype determination (diffuse large B-cell, follicular, mantle cell, marginal zone, etc.) is critical for treatment selection and prognosis. While the site specificity is valuable, coders should always query for the B-cell subtype from pathology before accepting this code.

Documentation Requirements

• ✓Pathology with immunophenotyping confirming B-cell lineage (CD20, CD19, PAX5 markers)
• ✓Clinical or imaging documentation confirming involvement of lymph nodes of head, face, and neck
• ✓Query provider for specific B-cell lymphoma subtype if pathology report is available
• ✓Staging information including Ann Arbor stage, B-symptoms, and performance status

Commonly Confused Codes