C90.3 Solitary plasmacytoma

The ICD-10-CM code for Solitary plasmacytoma is C90.3 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C81-C96: Malignant neoplasms of lymphoid, hematopoietic and related tissue (C81-C96)

Category C90

17 codes (12 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to C90.3:

• Plasmacytoma
• Plasmacytoma › solitary
• Myeloma (multiple) › monostotic
• Myeloma (multiple) › solitary

Inclusion Terms

• Localized malignant plasma cell tumor NOS
• Plasmacytoma NOS
• Solitary myeloma

Official Coding Guidelines

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool