ICD-10 Code C82.23 – Follicular lymphoma grade III, unspecified, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.23 – Follicular lymphoma grade III, unspecified, intra-abdominal lymph nodes
What it is
This code identifies follicular lymphoma grade III involving intra-abdominal lymph nodes, when the grade III subtype is not further specified. Use it for documented lymphoma in abdominal nodes, not for other lymph node regions.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include enlarged intra-abdominal lymph nodes, abdominal discomfort, or imaging evidence of nodal disease, with diagnosis confirmed by pathology.
When to use this code
Use C82.23 when the record clearly states follicular lymphoma grade III and the involved nodes are intra-abdominal. Apply it when the provider documents the site as abdominal, mesenteric, retroperitoneal, or similar intra-abdominal nodes. Check documentation if the grade or nodal site is unclear.
Do not use for
Do not use this code for follicular lymphoma in non-abdominal lymph nodes or when the grade is not documented as III. If the site is generalized or unspecified, check documentation for the correct code.
Coding tip
Confirm both the grade and the lymph node location in the pathology or oncology note before assigning C82.23.