ICD-10 Code C84.97 – Mature T/NK-cell lymphomas, unspecified, spleen (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.97 – Mature T/NK-cell lymphomas, unspecified, spleen
What it is
This code identifies a mature T-cell or natural killer cell lymphoma involving the spleen when the specific subtype is not documented. Use it for splenic disease within this lymphoma group.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings may include splenic enlargement, abdominal discomfort, and other lymphoma-related systemic features, but the exact presentation depends on the confirmed subtype.
When to use this code
Use this code when the record clearly states a mature T/NK-cell lymphoma affecting the spleen and does not name a more specific subtype. It also fits cases where the spleen is the documented site of involvement and the provider leaves the lymphoma type unspecified.
Check documentation if the chart mentions multiple lymphoma sites or a different primary diagnosis. Code the most specific confirmed diagnosis available, and do not assume splenic involvement without explicit provider documentation.
Do not use for
Do not use this code for Hodgkin lymphoma, B-cell lymphomas, or lymphomas without splenic involvement. If the subtype or site is documented more specifically, use the more exact code instead.
Coding tip
Verify both the cell type and the spleen site in the provider note before assigning C84.97.