ICD-10 Code C82.45 – Follicular lymphoma grade IIIb, lymph nodes of inguinal region and lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.45 – Follicular lymphoma grade IIIb, lymph nodes of inguinal region and lower limb
What it is
This code identifies follicular lymphoma grade IIIb involving lymph nodes in the inguinal region and lower limb. Use it when documentation specifies this exact histologic grade and nodal location.
Clinical signs
Clinical features vary; refer to documentation. Common findings in lymphoma may include enlarged lymph nodes, often painless, and imaging or biopsy confirmation of follicular lymphoma grade IIIb.
When to use this code
Use this code when the provider documents follicular lymphoma grade IIIb and specifies the inguinal or lower-limb lymph nodes as the site. It is appropriate for confirmed diagnoses, not for suspected lymphoma. If laterality or exact nodal region is unclear, check documentation.
Do not use for
Do not use this code for other lymphoma grades, other nodal regions, or unspecified follicular lymphoma. Do not assign it when the record only says “lymphoma” or “lymphadenopathy.”
Coding tip
Match the histologic grade and lymph node location exactly; if either is missing, query the provider.