ICD-10 Code C82.04 – Follicular lymphoma grade I, lymph nodes of axilla and upper limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.04 – Follicular lymphoma grade I, lymph nodes of axilla and upper limb
What it is
This code identifies grade I follicular lymphoma involving lymph nodes in the axilla or upper limb. It is a low-grade B-cell non-Hodgkin lymphoma documented at that specific nodal site.
Clinical signs
Clinical features vary; refer to documentation. Commonly, you may see painless lymph node enlargement in the axilla or nearby upper-limb nodes, with diagnosis confirmed by pathology and site-specific clinical findings.
When to use this code
Use C82.04 when the record clearly states follicular lymphoma grade I and specifies lymph nodes of the axilla or upper limb. You should code this when the provider documents the anatomic site, not just generalized lymphoma.
If the note mentions follicular lymphoma without grade or location, check documentation before assigning this code. Use the most specific code supported by the pathology report, oncology note, or discharge summary.
Do not use for
Do not use this code for unspecified follicular lymphoma, other grades, or lymphoma in different nodal regions. Check documentation if the site is not clearly axillary or upper-limb.
Coding tip
Verify both grade I and the exact lymph node location in the record before coding.