Solitary plasmacytoma in relapse

This code signifies the recurrence of a solitary plasmacytoma, a localized proliferation of clonal plasma cells, after a period of remission or successful treatment. It indicates that the disease, which was previously confined to a single site, has returned.

Apply this code when documentation confirms a diagnosis of solitary plasmacytoma that has recurred following prior treatment. This typically applies to patients who have undergone radiation or surgical excision for a solitary plasmacytoma and now present with evidence of disease relapse at the original or a new solitary site.

• Differentiate from multiple myeloma in relapse (C90.02) or extramedullary plasmacytoma in relapse (C90.22).
• Ensure documentation clearly states "solitary plasmacytoma" and "in relapse" or "recurrent."
• Code any associated complications or manifestations of the relapse separately.