C96.2Malignant mast cell neoplasm

C96.2 is the ICD-10-CM diagnosis code for malignant mast cell neoplasm. It belongs to category C96 (other and unspecified malignant neoplasms of lymphoid, hematopoietic and related tissue), 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 4 subcodes must be used instead.

Within C96 (other and unspecified malignant neoplasms of lymphoid, hematopoietic and related tissue), C96.2 is specifically for malignant mast cell neoplasm. Related codes cover multifocal and multisystemic (disseminated) Langerhans-cell histiocytosis (C96.0), sarcoma of dendritic cells (accessory cells) (C96.4), multifocal and unisystemic Langerhans-cell histiocytosis (C96.5), Unifocal Langerhans-cell histiocytosis (C96.6), malignant neoplasm of lymphoid, hematopoietic and related tissue, unspecified (C96.9), histiocytic sarcoma (C96.A) and other specified malignant neoplasms of lymphoid, hematopoietic and related tissue (C96.Z).

To report this condition, pick the subcode that matches the documentation: C96.20 (unspecified), C96.21 (mastocytosis), C96.22 (sarcoma) and C96.29 (neoplasm).

Don't report C96.2 together with the conditions in its Excludes1 note: indolent mastocytosis (D47.02), mast cell leukemia (C94.30) and mastocytosis (congenital) (cutaneous) (Q82.2).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2018 (title revised).