ICD-10-CM > C00-D49 > D37-D48 > D47 > D47.0 D47.0 Mast cell neoplasms of uncertain behavior Non-Billable/Non-Specific Type 1 Excludes congenital cutaneous mastocytosis (Q82.2)histiocytic neoplasms of uncertain behavior (D47.Z9)malignant mast cell neoplasm (C96.2-) Codes D47.01Cutaneous mastocytosisD47.02Systemic mastocytosisD47.09Other mast cell neoplasms of uncertain behavior