AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2017 Issue 4; New/Revised ICD-10-CM Diagnosis Codes

Mastocytosis and Certain Other Mast Cell Disorders

Currently in ICD-10-CM, mastocytosis and mast cell neoplasms are classified to a few different categories. Subcategory C96.2, Malignant mast cell neoplasm, has been expanded and new codes created. Certain types of mastocytosis are malignant and are classified to code C96.2, Malignant mast cell tumor. New codes have been created for unspecified malignant mast cell neoplasm (C96.20), aggressive systemic mastocytosis (C96.21), mast cell sarcoma (C96.22), and other malignant mast cell neoplasm (C96.29). Other types of mastocytosis and mast cell neoplasms are classified in ICD-10-CM with neoplasms of uncertain behavior. New codes were created at...

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