ICD-10 Code C84.A7 – Cutaneous T-cell lymphoma, unspecified, spleen (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.A7 – Cutaneous T-cell lymphoma, unspecified, spleen
What it is
This code identifies cutaneous T-cell lymphoma, unspecified, with spleen involvement. Use it when the record documents skin-based T-cell lymphoma and splenic disease, but does not specify a more exact subtype.
Clinical signs
Clinical features vary; refer to documentation. Typical records may describe persistent skin lesions, lymphomatous skin involvement, and splenic enlargement or involvement confirmed by the treating clinician.
When to use this code
Use this code when the provider documents cutaneous T-cell lymphoma and specifically notes spleen involvement, but the subtype remains unspecified. It is appropriate for confirmed lymphoma cases where the spleen is part of the documented disease burden. If the record names a more specific cutaneous T-cell lymphoma or another site, code that documentation instead.
Do not use for
Do not use this code for cutaneous T-cell lymphoma without spleen involvement, or when the diagnosis is a different lymphoma type. Check documentation if the splenic finding is only suspected or unrelated.
Coding tip
Match both elements in the chart: unspecified cutaneous T-cell lymphoma and spleen involvement, and code the most specific documented diagnosis.