ICD-10-CM 2027
ICD-10 code for monostotic myeloma
From the official ICD-10-CM alphabetic index entry “Myeloma (multiple) › monostotic”. Page updated September 29, 2026.
About coding monostotic myeloma
The ICD-10-CM code for monostotic myeloma is C90.3 (Solitary plasmacytoma). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on C90.3.
Within C90 (multiple myeloma and malignant plasma cell neoplasms), C90.3 is specifically for Solitary plasmacytoma. Related codes cover multiple myeloma (C90.0), plasma cell leukemia (C90.1) and Extramedullary plasmacytoma (C90.2).
To report this condition, pick the subcode that matches the documentation: C90.30 (not having achieved remission), C90.31 (in remission) and C90.32 (in relapse).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific monostotic myeloma codes (official index)
- plasma cell C90.0 — Multiple myeloma
Common questions about monostotic myeloma ICD-10 codes
What is the ICD-10 code for monostotic myeloma?
- C90.3 — Solitary plasmacytoma (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: C90.0.
What is the ICD-10 code for plasma cell monostotic myeloma?
- C90.0 — Multiple myeloma (header code; choose a more specific subcode).
Is C90.3 billable?
- No. C90.3 is a header code. Report one of its more specific subcodes instead.