ICD-10 Code C82.05 – Follicular lymphoma grade I, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.05 – Follicular lymphoma grade I, lymph nodes of inguinal region and lower limb
What it is
This code identifies grade I follicular lymphoma affecting lymph nodes in the groin or lower limb region. It is a specific, low-grade B-cell non-Hodgkin lymphoma documented by site and histologic grade.
Clinical signs
Clinical features vary; refer to documentation. Patients may have persistent enlarged lymph nodes in the inguinal area or lower extremity, with lymphoma confirmed by pathology or specialist assessment.
When to use this code
Use this code when the provider documents grade I follicular lymphoma and specifies involvement of inguinal-region or lower-limb lymph nodes. Code it from confirmed diagnoses, not from imaging suspicion alone. If the site or grade is unclear, check documentation before assigning C82.05.
Do not use for
Do not use this code for unspecified follicular lymphoma, other nodal sites, or higher-grade disease. If the record describes a different lymphoma type, code that diagnosis instead.
Coding tip
Match both the histologic grade and the exact nodal site in the provider note before selecting C82.05.