ICD-10-CM
ICD-10 code for Mast cell tumor: D47.09
The ICD-10-CM index points "Mast cell tumor" to D47.09, Other mast cell neoplasms of uncertain behavior. D47.09 is a billable code.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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