C84.99
BillableMature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
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 type of blood cancer affecting T cells or natural killer cells that has spread to organs outside the lymph node system, but the specific subtype cannot be determined.
Coding Tips
- •Use this code only when the specific type of mature T/NK-cell lymphoma cannot be identified
- •The '99' indicates extranodal and solid organ involvement; verify documentation specifies organ sites affected
Clinical Significance
Mature T/NK-cell lymphomas, unspecified, involving extranodal and solid organ sites indicates unclassified T/NK-cell lymphoma affecting organs outside the lymphatic system. Extranodal T-cell lymphomas include several specific entities (enteropathy-associated, hepatosplenic, subcutaneous panniculitis-like) that should be excluded before using this unspecified code. Specific subtyping is critical for treatment selection.
Documentation Requirements
- ✓Pathology confirming mature T-cell or NK-cell lymphoma in extranodal tissue
- ✓Specific organ or extranodal site identified
- ✓Biopsy of extranodal site with immunophenotyping
- ✓Documentation excluding specific extranodal T-cell lymphoma subtypes
- ✓Clinical staging
Commonly Confused Codes
C86.0 — Extranodal NK/T-cell lymphoma, nasal type: Specific EBV-associated entity affecting nasal/midface regionC86.1 — Hepatosplenic T-cell lymphoma: Specific entity affecting liver and spleenC86.2 — Enteropathy-associated T-cell lymphoma: Specific GI tract entity associated with celiac diseaseC86.3 — Subcutaneous panniculitis-like T-cell lymphoma: Specific entity involving subcutaneous fatC84.97 — Mature T/NK-cell lymphoma, spleen: Spleen has its own code
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.9Mature T/NK-cell lymphomas, unspecified└C84.99Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites
└C84.99Mature T/NK-cell lymphomas, unspecified, extranodal and solid organ sites