ICD-10 Code C84.A2 – Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.A2 – Cutaneous T-cell lymphoma, unspecified, intrathoracic lymph nodes
What it is
This code identifies cutaneous T-cell lymphoma, unspecified, with involvement of intrathoracic lymph nodes. Use it when the record supports this lymphoma type but does not specify a more exact subtype.
Clinical signs
Findings may include persistent skin lesions, plaques, or tumors consistent with cutaneous T-cell lymphoma, along with documented intrathoracic lymph node involvement. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents cutaneous T-cell lymphoma and specifies intrathoracic lymph node involvement, but the subtype remains unspecified. It is appropriate for confirmed disease in the chest node region. Do not infer nodal involvement from imaging alone unless the diagnosis is documented.
Do not use for
Do not use this code for cutaneous T-cell lymphoma without intrathoracic lymph node involvement, or when a more specific lymphoma subtype is documented. Check documentation if the record only mentions enlarged nodes.
Coding tip
Confirm both the lymphoma type and the intrathoracic node site in the provider note before assigning C84.A2.