Skip to content
Dx

ICD-10-CM 2027 diagnosis code

M33.9Dermatopolymyositis, unspecified

Not billable — use a more specific code

M33.9 is a header code, so it can't be reported by itself. Choose one of the 5 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 M33.9

M33.9 is the ICD-10-CM diagnosis code for Dermatopolymyositis, unspecified. 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 M33.9 (unspecified) only when documentation doesn't support a more specific option: juvenile dermatomyositis (M33.0), other dermatomyositis (M33.1) and Polymyositis (M33.2).

To report this condition, pick the subcode that matches the documentation: M33.90 (organ involvement unspecified), M33.91 (with respiratory involvement), M33.92 (with myopathy), M33.93 (without myopathy) and M33.99 (with other organ involvement).

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 M33.9

Notes that apply from higher levels

Instructions written at a parent level also apply to M33.9.

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

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about M33.9

Is M33.9 billable?

No. M33.9 is a header code. Report one of its more specific subcodes instead.