ICD-10 Code C90.30 – Solitary plasmacytoma not having achieved remission (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C90.30 – Solitary plasmacytoma not having achieved remission
What it is
This code identifies a solitary plasmacytoma that is still active and has not gone into remission. It refers to a single localized plasma cell tumor, usually in bone or soft tissue, with persistent disease documented.
Clinical signs
Clinical features vary; refer to documentation. Common references include a localized mass, pain, or symptoms from bone involvement, with pathology confirming a plasma cell neoplasm and no evidence of remission.
When to use this code
Use C90.30 when the provider documents solitary plasmacytoma and states it has not achieved remission, remains active, or is persistent. You should also use it when follow-up notes confirm ongoing disease after prior diagnosis. If remission status is not stated, check documentation.
Do not use for
Do not use this code for multiple myeloma, plasmacytoma in remission, or cases where the diagnosis is uncertain. If the record describes a different plasma cell disorder, code that condition instead.
Coding tip
Verify both the diagnosis and the remission status in the provider note before assigning C90.30.