ICD-10 Code C82.33 – Follicular lymphoma grade IIIa, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.33 – Follicular lymphoma grade IIIa, intra-abdominal lymph nodes
What it is
This code identifies follicular lymphoma grade IIIa affecting intra-abdominal lymph nodes. It is used when the diagnosis specifically documents this lymphoma subtype and nodal location.
Clinical signs
Clinical features vary; refer to documentation. Follicular lymphoma may present with enlarged lymph nodes, abdominal discomfort, or incidental imaging findings, but grading and site must be confirmed in the record.
When to use this code
Use C82.33 when the provider documents follicular lymphoma grade IIIa in intra-abdominal lymph nodes. Apply it for confirmed diagnoses in pathology, oncology, or discharge documentation that specifies both grade and location.
If the record only says follicular lymphoma without grade IIIa or without intra-abdominal nodal involvement, you need a different code. Check documentation for exact histology and anatomic site before assigning this code.
Do not use for
Do not use this code for other follicular lymphoma grades, unspecified follicular lymphoma, or disease outside intra-abdominal lymph nodes. Check documentation if the site or grade is unclear.
Coding tip
Code only when both grade IIIa and intra-abdominal lymph node involvement are explicitly documented.