ICD-10-CM 2027 diagnosis code

M33.1Other dermatomyositis

Not billable — use a more specific code

M33.1 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M33.1

M33.1 is the ICD-10-CM diagnosis code for other dermatomyositis. It belongs to category M33 (Dermatopolymyositis), 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 5 subcodes must be used instead.

Within M33, choose M33.1 (Other dermatomyositis) only when documentation doesn't support a more specific option: juvenile dermatomyositis (M33.0), Polymyositis (M33.2) and unspecified (M33.9).

To report this condition, pick the subcode that matches the documentation: M33.10 (organ involvement unspecified), M33.11 (with respiratory involvement), M33.12 (with myopathy), M33.13 (without myopathy) and M33.19 (with other organ involvement).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2018 (title revised).

Specific codes under M33.1

Coding notes

Applicable toConditions and synonyms classified to this code

Adult dermatomyositis

Notes that apply from higher levels

Instructions written at a parent level also apply to M33.1.

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

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)
FY2018 (effective 10/1/2017): Title revised — was “Other dermatopolymyositis”

Common questions about M33.1

Is M33.1 billable?: No. M33.1 is a header code. Report one of its more specific subcodes instead.