C84.Z4
BillableOther mature T/NK-cell lymphomas, lymph nodes of axilla and upper limb
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 rare type of mature T-cell or NK-cell blood cancer affecting lymph nodes in the armpits and upper arms.
Coding Tips
- •Ensure documentation specifies axillary or upper limb lymph node involvement
- •Verify this is not a secondary site of spread from a primary tumor elsewhere
Clinical Significance
Other mature T/NK-cell lymphoma involving lymph nodes of axilla and upper limb represents a rare aggressive neoplasm requiring specific anatomical documentation. Accurate site coding to axillary or epitrochlear lymph node regions of the upper extremity supports treatment planning and staging assessment. These lymphomas have variable prognosis depending on subtype, with some being highly aggressive and treatment-resistant.
Documentation Requirements
- ✓Pathology confirmation of mature T-cell or NK-cell lineage via immunophenotyping (CD3+, CD4/CD8, CD56 for NK-cell)
- ✓Imaging or clinical documentation confirming involvement of lymph nodes of axilla and upper limb
- ✓Specific subtype identification when possible (angioimmunoblastic, hepatosplenic, extranodal NK/T-cell, etc.)
- ✓Ann Arbor staging and whether B-symptoms (fever, night sweats, weight loss) are present
Commonly Confused Codes
C84.A series (Cutaneous T-cell lymphoma) — C84.Z is for non-cutaneous mature T/NK-cell subtypes; verify the lymphoma is NOT a cutaneous subtypeC84.4x (Peripheral T-cell lymphoma, not elsewhere classified) — C84.4 is specifically for PTCL-NOS; C84.Z covers other named subtypes not classified elsewhereC86.x (Other specified T/NK-cell lymphomas) — Check C86 codes first for hepatosplenic (C86.1), enteropathy-associated (C86.2), or subcutaneous panniculitis-like (C86.3) subtypes
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.ZOther mature T/NK-cell lymphomas└C84.Z4Other mature T/NK-cell lymphomas, lymph nodes of axilla and upper limb
└C84.Z4Other mature T/NK-cell lymphomas, lymph nodes of axilla and upper limb