ICD-10 Code C83.02 – Small cell B-cell lymphoma, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C83.02 – Small cell B-cell lymphoma, intrathoracic lymph nodes
What it is
C83.02 identifies small cell B-cell lymphoma involving intrathoracic lymph nodes. Use it when documentation specifies this lymphoma subtype and nodal location.
Clinical signs
Clinical features vary; refer to documentation. Patients may have enlarged intrathoracic lymph nodes found on imaging or biopsy, with or without chest-related symptoms.
When to use this code
Use this code when the provider documents small cell B-cell lymphoma in intrathoracic lymph nodes, including mediastinal or hilar nodal involvement if specified as intrathoracic. Code it from confirmed pathology, oncology assessment, or clearly documented diagnosis. If the site or subtype is unclear, check documentation.
Do not use for
Do not use this code for other lymphoma subtypes, unspecified lymph node sites, or nonmalignant lymphadenopathy. If the record does not clearly support intrathoracic nodal involvement, check documentation.
Coding tip
Match both the lymphoma subtype and the anatomic site exactly as documented before assigning C83.02.