ICD-10-CM 2027 diagnosis code

C90Multiple myeloma and malignant plasma cell neoplasms

Not billable — use a more specific code

C90 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About C90

C90 is the ICD-10-CM diagnosis code for multiple myeloma and malignant plasma cell neoplasms. It belongs to block C81-C96 (malignant neoplasms of lymphoid, hematopoietic and related tissue) and chapter 2 (neoplasms). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: C90.0 (myeloma), C90.1 (leukemia), C90.2 (plasmacytoma) and C90.3 (plasmacytoma).

Don't report C90 together with the conditions in its Excludes1 note: personal history of other malignant neoplasms of lymphoid, hematopoietic and related tissues (Z85.79).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under C90

Coding notes

Excludes1Not coded here — never report together with this code

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

Notes that apply from higher levels

Instructions written at a parent level also apply to C90.

Broader instructions also apply from C81-C96 Malignant neoplasms of lymphoid, hematopoietic and related tissue and Chapter 2: Neoplasms.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about C90

Is C90 billable?: No. C90 is a header code. Report one of its more specific subcodes instead.