ICD-10 Code C84.A5 – Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.A5 – Cutaneous T-cell lymphoma, unspecified, lymph nodes of inguinal region and lower limb
What it is
This code identifies cutaneous T-cell lymphoma with involvement of the inguinal or lower-limb lymph nodes, when the specific subtype is not further stated. Use it for documented skin-based T-cell lymphoma with regional nodal spread in that anatomic area.
Clinical signs
Findings often include persistent skin lesions consistent with cutaneous T-cell lymphoma and evidence of regional lymph node involvement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record states cutaneous T-cell lymphoma, unspecified, and specifies lymph nodes of the inguinal region or lower limb. It also fits when the clinician documents nodal involvement in that drainage area without naming a more specific subtype. Check documentation if the site or lymphoma type is unclear.
Do not use for
Do not use it for cutaneous T-cell lymphoma without documented inguinal or lower-limb nodal involvement. Do not use it when another lymphoma type, nodal region, or more specific subtype is clearly documented.
Coding tip
Confirm both the unspecified cutaneous T-cell lymphoma diagnosis and the exact nodal region before assigning C84.A5.