ICD-10-CM 2027 diagnosis code

M33Dermatopolymyositis

Not billable — use a more specific code

M33 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 M33

M33 is the ICD-10-CM diagnosis code for Dermatopolymyositis. It belongs to block M30-M36 (systemic connective tissue disorders) and chapter 13 (diseases of the musculoskeletal system and connective tissue). 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: M33.0 (dermatomyositis), M33.1 (dermatomyositis), M33.2 (Polymyositis) and M33.9 (unspecified).

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 M33

Notes that apply from higher levels

Instructions written at a parent level also apply to M33.

Broader instructions also apply from M30-M36 Systemic connective tissue disorders and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Codes whose notes reference M33

G72Excludes1

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 M33

Is M33 billable?: No. M33 is a header code. Report one of its more specific subcodes instead.