ICD-10 Code C82.13 – Follicular lymphoma grade II, intra-abdominal lymph nodes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C82.13 – Follicular lymphoma grade II, intra-abdominal lymph nodes
What it is
This code identifies follicular lymphoma, grade II, involving intra-abdominal lymph nodes. It is a malignant B-cell non-Hodgkin lymphoma documented as grade II and limited to abdominal nodal sites.
Clinical signs
Clinical features vary; refer to documentation. Patients may have enlarged intra-abdominal lymph nodes, abdominal discomfort, or incidental imaging findings, with confirmation by pathology and lymphoma grading.
When to use this code
Use this code when the provider documents follicular lymphoma grade II and specifies intra-abdominal lymph node involvement. It may also apply when pathology or oncology notes clearly identify the site as abdominal nodal disease. Check documentation if the site is described more broadly or if grade is not stated.
Do not use for
Do not use this code for other follicular lymphoma grades, unspecified nodal sites, or extranodal disease. If the record does not confirm grade II and intra-abdominal lymph nodes, check documentation.
Coding tip
Always match both the lymphoma grade and the exact anatomic site before assigning C82.13.