2026 ICD-10-CM Diagnosis Code C90Multiple myeloma and malignant plasma cell neoplasms

ICD-10-CM Codes›C00–D49›C81-C96›C90

ICD-10-CM C90
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C90 is a non-billable ICD-10-CM category code for multiple myeloma and malignant plasma cell neoplasms, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C90.00, C90.01, C90.02, and C90.10.

Code Identity

ICD-10-CM Code
C90
Billable Status
No — Non-Billable Category
Code Describes
Multiple myeloma and malignant plasma cell neoplasms
Chapter
C81-C96
Malignant neoplasms of lymphoid, hematopoietic and related tissue

Code Classification

ChapterC00–D49Neoplasms
SectionC81-C96Malignant neoplasms of lymphoid, hematopoietic and related tissue
CategoryC90Multiple myeloma and malignant plasma cell neoplasms
This CodeC90Multiple myeloma and malignant plasma cell neoplasms

Specific Coding for Multiple myeloma and malignant plasma cell neoplasmsOverview

Non-specific codes like C90 require more characters. Use one of these billable codes instead:

  • C90.0 for Multiple myeloma

  • Use C90.00 for Multiple myeloma not having achieved remission

  • Use C90.01 for Multiple myeloma in remission

  • Use C90.02 for Multiple myeloma in relapse

  • C90.1 for Plasma cell leukemia

  • Use C90.10 for Plasma cell leukemia not having achieved remission

  • Use C90.11 for Plasma cell leukemia in remission

  • Use C90.12 for Plasma cell leukemia in relapse

  • C90.2 for Extramedullary plasmacytoma

  • Use C90.20 for Extramedullary plasmacytoma not having achieved remission

  • Use C90.21 for Extramedullary plasmacytoma in remission

  • Use C90.22 for Extramedullary plasmacytoma in relapse

  • C90.3 for Solitary plasmacytoma

  • Use C90.30 for Solitary plasmacytoma not having achieved remission

  • Use C90.31 for Solitary plasmacytoma in remission

  • Use C90.32 for Solitary plasmacytoma in relapse

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues Z85.79

Patient EducationClinical

Cancer

Cancer is not just one disease but many diseases. Cancer begins in your cells, which are the building blocks of your body. Usually, your body forms new cells as needed, replacing old cells that die. Sometimes this process goes wrong. New cells grow even when you don't need them, and old cells don't die when they should.

The full article covers:

  • What is cancer?
  • What are the types of cancer?
  • How does cancer develop?
  • What are the symptoms of cancer?
  • How is cancer diagnosed?
  • What are the treatments for cancer?
  • Can cancer be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C90Overview

Is C90 (Multiple myeloma and malignant plasma cell neoplasms) a billable code?

No. This is a category header that groups the codes for multiple myeloma and malignant plasma cell neoplasms, and headers cannot be submitted on claims. Claims for multiple myeloma and malignant plasma cell neoplasms need a more specific code from this category, such as C90.00, C90.01, and C90.02.