ICD-10 Code C84.92 – Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C84.92 – Mature T/NK-cell lymphomas, unspecified, intrathoracic lymph nodes
What it is
C84.92 identifies a mature T-cell or NK-cell lymphoma affecting intrathoracic lymph nodes, when the subtype is not further specified. Use it for documented lymphoma involvement in chest lymph nodes.
Clinical signs
Clinical features vary; refer to documentation. Patients may have imaging or biopsy evidence of intrathoracic lymph node lymphoma, with findings such as mediastinal or hilar node enlargement.
When to use this code
Use this code when the provider documents a mature T/NK-cell lymphoma in intrathoracic lymph nodes and does not name a more specific subtype. It also fits cases where pathology confirms T/NK-cell lymphoma but the record only localizes disease to the chest nodes. If the site or histology is more specific, code that detail instead.
Do not use for
Do not use this code for other lymphoma types, such as B-cell lymphomas, or for non-lymphoma chest masses. Check documentation if the intrathoracic nodal site or exact lymphoma subtype is unclear.
Coding tip
Code the most specific lymphoma type and nodal site available; if either is missing, verify the pathology or provider note before assigning C84.92.