ICD-10 Code C82.46 – Follicular lymphoma grade IIIb, intrapelvic lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.46 – Follicular lymphoma grade IIIb, intrapelvic lymph nodes
What it is
This code identifies follicular lymphoma grade IIIb involving intrapelvic lymph nodes. It represents a specific, high-grade B-cell lymphoma documented in pelvic lymph node sites.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include enlarged lymph nodes, constitutional “B” symptoms, or imaging and biopsy results confirming grade IIIb follicular lymphoma in the pelvis.
When to use this code
Use this code when the provider documents follicular lymphoma grade IIIb and specifies intrapelvic lymph node involvement. It also fits when pathology or oncology notes clearly localize the disease to pelvic nodes. Check documentation if the grade or nodal site is not explicit.
Do not use for
Do not use this code for other lymphoma grades, unspecified follicular lymphoma, or non-pelvic nodal sites. If the record does not confirm grade IIIb, check documentation.
Coding tip
Verify both the histologic grade and the anatomic site before assigning C82.46.