ICD-10 Code C84.06 – Mycosis fungoides, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.06 – Mycosis fungoides, intrapelvic lymph nodes
What it is
C84.06 identifies mycosis fungoides involving the intrapelvic lymph nodes. Use it when documentation shows this cutaneous T-cell lymphoma has spread to pelvic lymph nodes.
Clinical signs
Findings may include persistent skin lesions from mycosis fungoides plus documented pelvic nodal involvement on exam, imaging, or pathology. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record specifically states mycosis fungoides with intrapelvic lymph node involvement. It is appropriate for confirmed nodal disease in the pelvis, whether noted during staging, biopsy, or specialist assessment. If the chart only says lymphoma or skin disease without pelvic node involvement, check documentation.
Do not use for
Do not use C84.06 for mycosis fungoides limited to skin or for lymph node sites outside the pelvis. Do not assign it when intrapelvic nodal involvement is not documented.
Coding tip
Verify the anatomic site carefully; the code depends on documented intrapelvic lymph node involvement, not just generalized lymphoma.