Solitary plasmacytoma not having achieved remission

This code signifies a solitary plasmacytoma that has not yet reached a state of remission. A solitary plasmacytoma is a localized proliferation of monoclonal plasma cells, typically occurring in bone (solitary bone plasmacytoma) or soft tissue (extramedullary plasmacytoma), without evidence of systemic multiple myeloma. "Not having achieved remission" indicates ongoing disease activity.

Use this code when documentation confirms a diagnosis of solitary plasmacytoma and explicitly states that the patient has not achieved remission following treatment or is still undergoing initial treatment. This code is appropriate for active disease management. Supporting documentation would include pathology reports confirming plasmacytoma and physician notes indicating persistent disease.

• Do not use this code if the plasmacytoma has progressed to multiple myeloma; instead, code for multiple myeloma.
• Distinguish carefully between "not having achieved remission" and "in remission" or "history of."
• Ensure documentation specifies "solitary" plasmacytoma to differentiate from systemic plasma cell disorders.