C83.9Non-follicular (diffuse) lymphoma, unspecified

C83.9 is the ICD-10-CM diagnosis code for non-follicular (diffuse) lymphoma, unspecified. It belongs to category C83 (non-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 C83, choose C83.9 (Non-follicular (diffuse) lymphoma, unspecified) only when documentation doesn't support a more specific option: small cell B-cell lymphoma (C83.0), Mantle cell lymphoma (C83.1), diffuse large B-cell lymphoma (C83.3), lymphoblastic (diffuse) lymphoma (C83.5), Burkitt lymphoma (C83.7) and other non-follicular lymphoma (C83.8).

To report this condition, pick the subcode that matches the documentation: C83.90 (unspecified site), C83.91 (lymph nodes of head, face, and neck), C83.92 (intrathoracic lymph nodes), C83.93 (intra-abdominal lymph nodes), C83.94 (lymph nodes of axilla and upper limb), C83.95 (lymph nodes of inguinal region and lower limb), C83.96 (intrapelvic lymph nodes), C83.97 (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.