ICD-10-CM > C00-D49 > C81-C96 > C90 > C90.2 C90.2 Extramedullary plasmacytoma Non-Billable/Non-Specific Codes C90.20Extramedullary plasmacytoma not having achieved remissionC90.21Extramedullary plasmacytoma in remissionC90.22Extramedullary plasmacytoma in relapse