C84.01
BillableMycosis fungoides, 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 19 — Lymphoma and Other Cancers
0.000What This Code Means
A rare type of skin cancer (mycosis fungoides) that has spread to the lymph nodes in the head, face, and neck area.
Coding Tips
- •Verify lymph node involvement in the head/neck region through imaging or biopsy
- •The '1' designator specifically indicates cervical and head/neck lymph node sites
Clinical Significance
Mycosis fungoides with involvement of head, face, and neck lymph nodes indicates progression beyond purely cutaneous disease. Lymph node involvement in mycosis fungoides represents a higher stage (Stage III-IV) and typically signals the need for systemic therapy rather than skin-directed treatment alone. This progression carries worse prognosis than skin-limited disease.
Documentation Requirements
- ✓Skin biopsy confirming mycosis fungoides
- ✓Lymph node biopsy or imaging confirming head/face/neck lymph node involvement
- ✓Distinction between reactive lymphadenopathy (common in mycosis fungoides) and pathologically confirmed lymph node involvement
- ✓TNMB staging reflecting nodal involvement
- ✓Current treatment plan addressing both cutaneous and nodal disease
Commonly Confused Codes
C84.00 — Mycosis fungoides, unspecified site: Use C84.01 when head/face/neck lymph node involvement is confirmed pathologicallyC84.11 — Sezary disease, head/face/neck: Sezary disease is distinct from mycosis fungoides despite both being cutaneous T-cell lymphomasC83.91 — Non-follicular lymphoma, unspecified, head/face/neck: Use when the lymphoma type is non-follicular but not mycosis fungoides
Code Hierarchy
└C84Mature T/NK-cell lymphomas└C84.0Mycosis fungoides└C84.01Mycosis fungoides, lymph nodes of head, face, and neck
└C84.01Mycosis fungoides, lymph nodes of head, face, and neck