ICD-10 Code C84.A3 – Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.A3 – Cutaneous T-cell lymphoma, unspecified, intra-abdominal lymph nodes
What it is
C84.A3 identifies cutaneous T-cell lymphoma, unspecified, involving intra-abdominal lymph nodes. Use it when the record documents this lymphoma site but does not specify a more exact cutaneous T-cell lymphoma subtype.
Clinical signs
Clinical features vary; refer to documentation. Commonly, charting may note lymph node enlargement, known cutaneous T-cell lymphoma, and evidence that intra-abdominal nodes are involved.
When to use this code
Use this code when the provider states cutaneous T-cell lymphoma with intra-abdominal lymph node involvement and does not identify a more specific subtype. It also applies when the site is confirmed in the assessment, pathology, or staging documentation. If the record only mentions skin disease or another nodal region, check documentation.
Do not use for
Do not use it for cutaneous T-cell lymphoma without documented intra-abdominal lymph node involvement. Do not assign it when another lymphoma type or a different nodal site is clearly documented.
Coding tip
Code the documented lymphoma site exactly as stated, and query the provider if the subtype or nodal involvement is unclear.