ICD-10 Code C84.07 – Mycosis fungoides, spleen (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.07 – Mycosis fungoides, spleen
What it is
C84.07 identifies mycosis fungoides involving the spleen. It is used when documentation shows this cutaneous T-cell lymphoma has spread to or is affecting the spleen.
Clinical signs
Clinical features vary; refer to documentation. Commonly, the record may note splenic involvement in a patient with established mycosis fungoides, sometimes with splenomegaly or other evidence of lymphoma spread.
When to use this code
Use this code when the provider documents mycosis fungoides with splenic involvement, secondary spread, or disease affecting the spleen. It may appear in oncology, hematology, pathology, or staging notes. Code the documented site exactly as stated.
Do not use for
Do not use this code for mycosis fungoides limited to skin or for nonspecific lymphoma without splenic involvement. Check documentation if the spleen is only mentioned as enlarged without a confirmed lymphoma diagnosis.
Coding tip
Match the code to the exact anatomic site documented; if splenic involvement is not clearly stated, do not assume it.