ICD-10 Code C82.02 – Follicular lymphoma grade I, intrathoracic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.02 – Follicular lymphoma grade I, intrathoracic lymph nodes
What it is
This code identifies follicular lymphoma, grade I, involving intrathoracic lymph nodes. It represents a low-grade B-cell non-Hodgkin lymphoma confined to lymph nodes in the chest region.
Clinical signs
Patients may have enlarged mediastinal or hilar lymph nodes, often found on imaging or biopsy. Clinical features vary; refer to documentation for symptoms, staging, and pathology confirmation.
When to use this code
Use C82.02 when the record documents follicular lymphoma grade I and specifies intrathoracic lymph node involvement. You should rely on pathology, oncology, or discharge documentation that clearly links the lymphoma to chest lymph nodes. If the site or grade is not stated, check documentation before coding.
Do not use for
Do not use this code for follicular lymphoma in other nodal groups or for unspecified lymphoma site. It is also incorrect if grade I is not documented or if the diagnosis is not confirmed. Check documentation.
Coding tip
Assign the code only when both the grade and intrathoracic nodal site are clearly documented.