ICD-10 Code C84.A6 – Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.A6 – Cutaneous T-cell lymphoma, unspecified, intrapelvic lymph nodes
What it is
C84.A6 identifies cutaneous T-cell lymphoma, unspecified, involving intrapelvic lymph nodes. Use it when the record documents this lymphoma subtype and pelvic nodal involvement, but does not specify a more exact cutaneous T-cell lymphoma type.
Clinical signs
Findings may include persistent skin lesions typical of cutaneous T-cell lymphoma and evidence of pelvic lymph node involvement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the clinician documents cutaneous T-cell lymphoma as unspecified and indicates intrapelvic lymph node involvement. It fits cases where the diagnosis is confirmed, but the subtype is not further defined in the chart.
Choose it only when the anatomic site is clearly the intrapelvic lymph nodes. If the record names a different nodal region or a more specific lymphoma diagnosis, code that instead.
Do not use for
Do not use this code for cutaneous T-cell lymphoma without documented intrapelvic lymph node involvement. Also avoid it when the lymphoma subtype is specified more precisely or when the documented nodes are outside the pelvis.
Coding tip
Verify both the unspecified cutaneous T-cell lymphoma diagnosis and the intrapelvic node site in the provider note before assigning C84.A6.