C84.91
BillableMature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 21 — Hodgkin Lymphoma and Other Cancers
0.000What This Code Means
A mature T-cell or natural killer cell lymphoma affecting the lymph nodes in the head, face, and neck region.
Coding Tips
- •Confirm the lymph node involvement is in the head, face, or neck area before coding
- •Document whether this is primary lymphoma or secondary involvement from another site
Clinical Significance
Mature T/NK-cell lymphomas, unspecified, involving head, face, and neck lymph nodes captures unclassified T-cell or NK-cell lymphoma in the cervicofacial nodal basin. While the subtype remains unspecified, the site specificity is important for treatment planning. Head and neck nodal involvement can affect swallowing, breathing, and cranial nerve function depending on disease extent.
Documentation Requirements
- ✓Pathology confirming mature T-cell or NK-cell lymphoma lineage
- ✓Documentation of head, face, or neck lymph node involvement
- ✓Immunophenotyping results confirming T-cell or NK-cell origin
- ✓Explanation if specific subtype cannot be determined
- ✓Clinical staging
Commonly Confused Codes
C84.41 — PTCL-NOS, head/face/neck: If pathology specifically classifies as PTCL-NOS, use this more specific codeC84.61 — ALCL ALK-positive, head/face/neck: If ALCL morphology with ALK positivity is confirmedC84.71 — ALCL ALK-negative, head/face/neck: If ALCL morphology with ALK negativity is confirmedC86.0 — Extranodal NK/T-cell lymphoma, nasal type: Specific NK/T-cell lymphoma of the nasal cavity and midface; distinct from nodal disease
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.9Mature T/NK-cell lymphomas, unspecified└C84.91Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck
└C84.91Mature T/NK-cell lymphomas, unspecified, lymph nodes of head, face, and neck