ICD-10 Code C90.20 – Extramedullary Plasmacytoma Not Having Achieved Remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C90.20 – Extramedullary plasmacytoma not having achieved remission
What it is
This code identifies extramedullary plasmacytoma that has not achieved remission. It indicates a plasma cell tumor located outside the bone marrow, with ongoing disease or no documented remission.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include a localized soft-tissue mass and symptoms related to the tumor’s site, with pathology confirming a plasmacytoma.
When to use this code
Use this code when the record clearly states extramedullary plasmacytoma and documents that remission has not been achieved. It may also apply when the provider describes persistent, active, or unresected disease without remission. Check documentation for the exact disease status.
Do not use for
Do not use this code if the plasmacytoma is in remission or if the record does not specify remission status. Do not confuse it with multiple myeloma or other plasma cell neoplasms.
Coding tip
Match the code to the provider’s remission wording exactly; if remission status is unclear, query the documentation.