C90.31
BillableSolitary plasmacytoma in remission
HCC Category Mapping
V28HCC 19 — Lymphoma and Other Cancers
0.105V24HCC 10 — Lymphoma and Other Cancers
0.675ESRDHCC 10 — Lymphoma and Other Cancers
0.000RxHCCHCC 16 — Multiple Myeloma and Plasma Cell Neoplasms
0.000What This Code Means
A single tumor made of plasma cells that is currently in remission with no active disease.
Coding Tips
- •Confirm remission status is explicitly documented by the physician before coding
- •Verify this is truly a solitary lesion and not multiple myeloma
Clinical Significance
Solitary plasmacytoma in remission indicates the single bone lesion has responded to treatment, typically radiation therapy, with resolution of the tumor. Despite remission, lifelong surveillance is essential due to the significant long-term risk of progression to multiple myeloma. Monitoring includes serial serum and urine protein studies, complete blood counts, and periodic imaging to detect new bone lesions.
Documentation Requirements
- ✓Remission must be explicitly documented by the provider with imaging evidence showing resolution of the bone lesion.
- ✓Ongoing surveillance parameters including protein electrophoresis results, bone marrow status, and imaging schedule must be recorded.
- ✓Any structural damage from the original lesion requiring ongoing management should be documented.
Commonly Confused Codes
C90.30 (solitary plasmacytoma not in remission) indicates active disease.C90.32 (solitary plasmacytoma in relapse) indicates recurrence.C90.01 (multiple myeloma in remission) should be used if the disease has progressed to systemic myeloma.Z85.79 is only for cured disease without ongoing surveillance needs.
Code Hierarchy
└C90Multiple myeloma and malignant plasma cell neoplasms└C90.3Solitary plasmacytoma└C90.31Solitary plasmacytoma in remission
└C90.31Solitary plasmacytoma in remission