C82.4Follicular lymphoma grade IIIb

C82.4 is the ICD-10-CM diagnosis code for follicular lymphoma grade IIIb. It belongs to category C82 (follicular lymphoma), block C81-C96 (malignant neoplasms of lymphoid, hematopoietic and related tissue) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 11 subcodes must be used instead.

Within C82 (follicular lymphoma), C82.4 is specifically for follicular lymphoma grade IIIb. Related codes cover grade I (C82.0), grade II (C82.1), grade III, unspecified (C82.2), grade IIIa (C82.3), diffuse follicle center lymphoma (C82.5), cutaneous follicle center lymphoma (C82.6), other types of follicular lymphoma (C82.8) and unspecified (C82.9).

To report this condition, pick the subcode that matches the documentation: C82.40 (unspecified site), C82.41 (lymph nodes of head, face, and neck), C82.42 (intrathoracic lymph nodes), C82.43 (intra-abdominal lymph nodes), C82.44 (lymph nodes of axilla and upper limb), C82.45 (lymph nodes of inguinal region and lower limb), C82.46 (intrapelvic lymph nodes), C82.47 (spleen) and 3 more.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.