C84.A1
BillableCutaneous T-cell lymphoma, 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 cancer of T cells that primarily affects the skin with involvement of lymph nodes in the head, face, and neck region.
Coding Tips
- •Use this code when documentation confirms lymph node involvement in head, face, or neck regions
- •Verify the site specification in the medical record to ensure accurate code selection
Clinical Significance
Cutaneous T-cell lymphoma, unspecified, involving head, face, and neck lymph nodes indicates a skin-based T-cell lymphoma with nodal progression to the cervicofacial region. Lymph node involvement in cutaneous T-cell lymphoma represents disease advancement beyond the skin and significantly impacts staging and prognosis. Head and neck nodes may be palpable on examination.
Documentation Requirements
- ✓Skin biopsy confirming cutaneous T-cell lymphoma
- ✓Physical exam or imaging documenting head, face, or neck lymph node involvement
- ✓Node biopsy or imaging confirming lymphomatous involvement (vs. reactive dermatopathic lymphadenopathy)
- ✓TNMB staging incorporating nodal findings
- ✓Explanation if specific CTCL subtype cannot be determined
Commonly Confused Codes
C84.01 — Mycosis fungoides, head/face/neck lymph nodes: If mycosis fungoides is specifically diagnosedC84.91 — Mature T/NK-cell lymphoma, unspecified, head/face/neck: General T/NK lymphoma without cutaneous specificationC84.41 — PTCL-NOS, head/face/neck: Nodal T-cell lymphoma, not cutaneous primaryC77.0 — Secondary malignant neoplasm, head/face/neck lymph nodes: Metastatic disease, not primary lymphoma
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.ACutaneous T-cell lymphoma, unspecified└C84.A1Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neck
└C84.A1Cutaneous T-cell lymphoma, unspecified lymph nodes of head, face, and neck