C85.1Unspecified B-cell lymphoma

C85.1 is the ICD-10-CM diagnosis code for unspecified B-cell lymphoma. It belongs to category C85 (other specified and unspecified types of non-Hodgkin 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 C85, choose C85.1 (Unspecified B-cell lymphoma) only when documentation doesn't support a more specific option: mediastinal (thymic) large B-cell lymphoma (C85.2), other specified types of non-Hodgkin lymphoma (C85.8) and Non-Hodgkin lymphoma, unspecified (C85.9).

To report this condition, pick the subcode that matches the documentation: C85.10 (unspecified site), C85.11 (lymph nodes of head, face, and neck), C85.12 (intrathoracic lymph nodes), C85.13 (intra-abdominal lymph nodes), C85.14 (lymph nodes of axilla and upper limb), C85.15 (lymph nodes of inguinal region and lower limb), C85.16 (intrapelvic lymph nodes), C85.17 (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.